Scissa's 2015 Polo 1.2 TSI

[scissa]

Hello everyone, in the recent months i was using this forum very frequently now i wanted to share my experiences and adventures throughout the ownership of the car. I am scissa and i live in Turkey. I am a mechanical engineer and had experiences in automobile industry at production plants.

The car is 14/5/2015 Comfortline equipped with CJZC EA211 1.2 TSI 90hp with PED 5sp. manual transmission. It has been purchased from the first owner at 8/2018, Currently it is at 103600 km's and it is increasing.

Recently, i have changed the spark plugs with a different one from the catalog and parts list. I used NGK 94224 IKER7A8EGS Iridium, which is service part for EA211 evo, or 1.5 TSI and 1.0 TSI models.
The stats were looking the same except the material and reach of the spark plugs. The EA211 1.2 and 1.4 TSI engines do originally use NGK 95463 PKER7A8EGS Platinum plugs.
I believe Iridium plugs are better compared to Platinum ones.

Since there was nothing to lose, I wanted to give it a shot. The specs of the plugs are:
Platinum Plugs
Iridium Plugs


When the plugs were original, the car was not misfiring on VCDS but i was definitely feeling them randomly at idle. I guess they were below the threshold to register as misfire.
When the plugs were changed first, the idle was horrible and the engine was about to leave the engine compartment
After few start and stop cycles, the result turned out to be absolutely amazing. Now the car is not sluggish anymore at any condition, it can pull from stand still like a rocket, or no need to downshift when climbing a hill with very low RPM such as 1300. Also, it consumes less fuel now.
I couldn't find any sources on the internet for this upgrade (except https://world.taobao.com/lang/en-us/goo ... 080876.htm), so i decided to create a guide for it for everyone who searches it.

For the oil change, the car had numerous oil brands through the ownership. The best ones for this engine are Motul and LiquiMoly. As you know, the engine has a very annoying cold start rattle/knock. These oils just prevent that noise completely.

I will share the mods that i applied or will apply like footwell lighting, glovebox lighting, second trunk light, cloth wrapping the plastics, windscreen wiper fluid sensor installation, sound insulation, dismantling the car, vcds coding, adding heated seats, problem solving, rcd radio upgrade with car menu , and many more for this platform.

Here is the car

The car

WhatsApp Image 2025-12-28 at 01.19.56.jpeg (95.39 KiB) Viewed 6889 times

Here is the VCDS scan from few months before:

Code: Select all

Sunday,09,November,2025,17:12:14:00009
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 25.3.2.0
Data version: 20250822 DS365.0
www.Ross-Tech.com


VIN: WVWZZZ6RZFY   License Plate: 
Mileage: 101678km-63179mi   Repair Order: 



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 6R-VW26 (6C0)
Scan: 01 03 08 09 15 17 19 44 5F

VIN: WVWZZZ6RZFY   Mileage: 101678km-63179miles

01-Engine -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
5F-Information Electr. -- Status: Malfunction 0010
 
-------------------------------------------------------------------------------
Address 01: Engine (J623-CJZC)       Labels:. 04E-907-309-V1.clb
   Part No SW: 04E 906 027 BB    HW: 04E 907 309 AF
   Component: R4 1.2l TFS   H22 9314  
   Revision: R4H22---    CVN: FFFDE515
   Coding: 01110012230411080000
   Shop #: WSC 03411 389 00000
   ASAM Dataset: EV_ECM12TFS01104E906027BB 001010
   ROD: EV_ECM12TFS01104E906027BB_VW26.rod
   VCID: 65C104936461CFB340-8030
   VINID: 9E69EAAAA1A2A96A43089109000B2727B4

   Center armrest control head 1: 

No fault code found.
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:. 6R0-907-37x-ESP90.clb
   Part No SW: 6C0 907 379 G    HW: 6R0 907 379 BA
   Component: ESP9.0i       H03 0003  
   Serial number: 08509884150419
   Coding: 21DD2885492533C9091810720051841492CC90080005CB098F00
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_Brake1ESP90iBOSCHPQ26 100018
   ROD: EV_Brake1ESP90iBOSCHPQ26_VW26.rod
   VCID: 3365AACB9A3561031E-8066

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J301)       Labels:| 6C0-820-045.clb
   Part No SW: 6C0 820 045 A    HW: 6C0 820 045 A
   Component: AC Manuell    H03 0108  
   Serial number:  1504211B-0431 Dataset Number: 6C0032v____ 0009
   Coding: 200000011000100000
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_ACManueKMMValeoPQ26 002001
   ROD: EV_ACManueKMMValeoPQ26_VW26.rod
   VCID: 1D316C730CB1C773D8-8048

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:| 6C0-937-BCM-V1.clb
   Part No SW: 6C0 937 089 B    HW: 6C0 937 089 
   Component: BCM PQ26 Hi4R H07 0065  
   Serial number: 001098061879 Dataset Number: 6C0063V____ 0223
   Coding: 00000840425300534B844000400703880000580251010000000000000000
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_BCMA0 004008
   ROD: EV_MQBA0.rod
   VCID: 2F6DA6BB761D45E37A-807A

   Driver door control module: 
   Subsystem 1 - Part No SW: 6R0 959 801 AT    HW: 6R0 959 801 AT  Labels: 6R0-959-801.CLB
   Component: J386__TSG_FT  003 8612 
   Serial number: KU0KU015041551054236
   Coding: 0400A0

   Front passenger door control module: 
   Subsystem 2 - Part No SW: 6R0 959 802 BE    HW: 6R0 959 802 BE  Labels: 6R0-959-802.CLB
   Component: J387__TSG_BT  003 8612 
   Serial number: KU0KU013041551034217
   Coding: 1400A0

   Rear Driver Side Door Control Module: 
   Subsystem 3 - Part No SW: 6R0 959 811 N    HW: 6R0 959 811 N
   Component: J388__TSG_HL  003 8611 
   Serial number: KU0KU002041550923934
   Coding: 0400A0

   Rear Passenger Door Control Module: 
   Subsystem 4 - Part No SW: 6R0 959 812 N    HW: 6R0 959 812 N
   Component: J389__TSG_HR  003 8611 
   Serial number: KU0KU007041550973434
   Coding: 1400A0

3 Faults Found:
8202 - Bulb for Left DRL 
          B121D 15 [00001000] - Open or Short to Plus
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 2
                    Fault Frequency: 41
                    Reset counter: 132
                    Mileage: 101245 km
                    Date: 2025.11.05
                    Time: 15:38:11

                    Terminal 15 status: OFF
                    Terminal 50 status: OFF
                    Status Bremslichtschalter (HW): OFF
                    Status Bremslichtschalter (CAN): OFF
                    OFF: operated
                    Position lamps: Not operated
                    Automatic high beam assist: Not operated
                    Low beam: Not operated
                    Parking light left: Not operated
                    Parking light right: Not operated
                    Stoerschutzzaehler: 0
                    Voltage: 12.1 V
                    Outside temperature: 23.0 °C

8458 - Bulb for Right DRL 
          B121E 15 [00001000] - Open or Short to Plus
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 2
                    Fault Frequency: 36
                    Reset counter: 92
                    Mileage: 101245 km
                    Date: 2025.11.05
                    Time: 15:38:58

                    Terminal 15 status: OFF
                    Terminal 50 status: OFF
                    Status Bremslichtschalter (HW): OFF
                    Status Bremslichtschalter (CAN): OFF
                    OFF: operated
                    Position lamps: Not operated
                    Automatic high beam assist: Not operated
                    Low beam: Not operated
                    Parking light left: Not operated
                    Parking light right: Not operated
                    Stoerschutzzaehler: 0
                    Voltage: 12.1 V
                    Outside temperature: 23.0 °C

206344 - Locking Unit for Central Locking; Driver Side 
          B1679 29 [00001001] - Signal Implausible
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 4
                    Fault Frequency: 1
                    Reset counter: 89
                    Mileage: 101253 km
                    Date: 2025.11.06
                    Time: 13:45:07

                    Terminal 15 status: On
                    Terminal 50 status: OFF
                    Status Bremslichtschalter (HW): On
                    Status Bremslichtschalter (CAN): On
                    OFF: operated
                    Position lamps: Not operated
                    Automatic high beam assist: Not operated
                    Low beam: Not operated
                    Parking light left: Not operated
                    Parking light right: Not operated
                    Stoerschutzzaehler: 0
                    Voltage: 12.2 V
                    Outside temperature: 77.5 °C


-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 6C0-959-655.clb
   Part No SW: 6C0 959 655 D    HW: 6C0 959 655 D
   Component: VW20Airbag00P 001 0360  
   Revision: --------    Serial number: 003RG000289M Dataset Number: 6C0003V____ 0365
   Coding: 8800C000000000005C0000CA000800000000
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_AirbaVW20BPAVW26X 001001
   ROD: EV_AirbaVW20BPAVW26X.rod
   VCID: 3467A9D79F3B663B07-8060

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 6C0-920-KOM-V1.clb-SRI3
   Part No SW: 6C0 920 740 A    HW: 6C0 920 740 A
   Component: KOMBI         211 0290  
   Coding: 072D09002180000800081A001000000000000000
   Shop #: WSC 19460 666 12345
   ASAM Dataset: EV_DashBoardVDDMQBAB 009040
   ROD: EV_DashBoardVDDMQBAB_009_VW26.rod
   VCID: 204F55873BC3EA9BF3-8074

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:| 6C0-909-901-V1.clb
   Part No SW: 6C0 909 901     HW: 6C0 937 089 
   Component: GW MQB A0     H07 0065  
   Revision: --------    Serial number: 001098061879 Dataset Number: 6C0067v____ 0039
   Coding: 030100047F0A560071000000000000010001010000000000000000000000
   Shop #: WSC 00788 648 00255
   GVL: 01403C0000000000400000000000480000000000000000000000000000000000
   ASAM Dataset: EV_GatewA0Lear 001001
   ROD: EV_GatewA0Lear_001_VW26.rod
   VCID: 65C104936461CFB340-8030

   Multifunction steering wheel control module: 
   Subsystem 1 - Part No SW: 6C0 959 442     HW: 6C0 959 442   Labels: 3C8-959-537.CLB
   Component: E221__MFL-TAT  H04 0019 
   Serial number: 1041513301201378AB1B
   Coding: 240000

   Battery Monitoring Control Module: 
   Subsystem 2 - Part No SW: 6C0 915 181 A    HW: 6C0 915 181 A
   Component: J367-BDM  H08 0223 
   Serial number: 52115320442821851152

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist (J792)       Labels:| 6Rx-909-144-V2.clb
   Part No SW: 6C1 909 144 M    HW: 6C1 909 144 D
   Component: EPS_TRW_ALow  312 3211  
   Serial number: PF570776 Dataset Number: 6C0074V____ 0224
   Coding: 0007
   Shop #: WSC 00788 648 00255
   ASAM Dataset: EV_SteerAssisUDSTRW 011021
   ROD: EV_SteerAssisUDSTRW_011.rod
   VCID: 326BAFCF652F680B15-8066

No fault code found.

-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:| 5G0-035-MIB-ENT2.clb
   Part No SW: 6C0 035 867 B    HW: 6C0 035 867 B
   Component: MU-E--ER      820 6230  
   Serial number: 22041500010257 Dataset Number: 5G0CV1v____ 0001
   Coding: 02620000BE0000004011000100010000000004040000010000
   Shop #: WSC 19460 666 12345
   ASAM Dataset: EV_MUEnt4CGen2LGE 001017
   ROD: EV_MUEnt4CGen2LGE_VW26.rod
   VCID: 285F4DA753F312DBBB-807C

1 Fault Found:
0007 - Connection between Antenna Amp 1 for Radio and Antenna 
          B1272 13 [00001001] - Open Circuit
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 6
                    Fault Frequency: 3
                    Reset counter: 92
                    Mileage: 101245 km
                    Date: 2025.11.05
                    Time: 15:36:54

                    Voltage terminal 30: 12.3 V
                    Status of antenna 1 for radio-Antenna current: 0 mA
                    Status of antenna 1 for radio-Connection between radio and antenna amplifier: electrically OK
                    Status of antenna 1 for radio-Connection between antenna amplifier and antenna: Open circuit
                    Status of antenna 1 for radio-Reception level antenna 1: 64 dBµV


End-------------------------(Elapsed Time: 02:32)--------------------------
------------------------------4 Faults Found-------------------------------

[Le_Combattant]

Your stories about spark plug is quite interesting but... there is something I do not
understand.

My car is end 2014, 1.2 TSI 16V E211 engine CJZC.

On ETKA, the P/N of the sparks plugs are: 04E905601B
According to NGK website part's, it's the "PZKER7B8EGS" (­94968, replaced by 93231) and not the "95463" as you wrote previously.

Capture d’écran 2025-12-28 150749.jpg (146.07 KiB) Viewed 6839 times

[RUM4MO]

Yes, i also replaced the factory fitted - in 2015 "A" version of these spark plugs with the "B" version, I never found out if the NGK "A" and "B" versions were exactly the same as the "A" and the "B" versions of the VW Group part numbers, but they seem to work okay.

What I discovered when I first fitted them to my wife's August 2015 VW Polo 1.2TSI 110, ie a CJZD engine, was that the SEAT Ibiza and maybe SEAT Leon with the CJZD engines were listed by NGK use the "B" version for 2015 built cars, but the VW Polo with the CJZD were listed as using the "A" version while the CJZC was listed as using the "B" version of the NGK spark plug.

I put that "irregularity" down to just a mistake on the part of NGK Europe, as by that time, the VW Group parts listing quoted the "B" version of the VW Group rebranded NGK spark plugs.

[Le_Combattant]

So what are the difference between the A and B version ?

Because according to some website, some spark plug listed in the first post have a longer thread (the iridium one).

So it's quite confusing.

It's even more confusing when you see contradiction from the manufacturer like this:

Here: thread lenght is 19mm between the two

pzker7b8egs-ver2.jpg (460.04 KiB) Viewed 6765 times

iker7a8egs-ver2.jpg (447.87 KiB) Viewed 6765 times

And here ? 19 and 20.5mm

Capture d’écran 2025-12-29 163504.jpg (40.71 KiB) Viewed 6765 times

Capture d’écran 2025-12-29 163536.jpg (41.3 KiB) Viewed 6765 times

[2226]

Very confusing. Even the specs in the 1st post indicate 1mm shorter on the Iridium.

If I hadn't done my plugs last year and spent a fortune on them, I might be looking at getting these Iridium. I'll wait until the next 100,000km is done.

[Le_Combattant]

Yeah but how to be sure to not damage the piston because of the extra lenght ?

[2226]

Only way to find out is have the 2 plugs side by side.
Go to dealer, ask for both plugs and then compare.

Perhaps the 20.5mm is without washer.

I just looked up the plug for the 1.5tsi (From a Taigo) and 1.0tsi.
Part 05E905602B lists with a 26.5mm to 28mm thread length.
Again, 1.5mm difference so some might be excluding the washer.

Not doing much digging on ETKA, but I don't see that lining up with the service part mentioned for the EA211 EVO.
And I'm not going to dig further into ETKA right now... it's 30C and 9PM at night ... Dying in the heat.

[Le_Combattant]

So, the the CJZC/CJZD engines, the sparks plugs are "04E905601B"

Or "PZKER7B8EGS" (93231):

Amt6BiVBEButVUyhwXNDBlMnM6U-960.jpg (67.98 KiB) Viewed 6682 times

So on NGK website:

-"04E905601B" (PZKER7B8EGS (93231)):

Capture d’écran 2025-12-31 195625.jpg (68.32 KiB) Viewed 6682 times

Capture d’écran 2025-12-31 195726.jpg (22.61 KiB) Viewed 6682 times

-NGK 94224 IKER7A8EGS:

Capture d’écran 2025-12-31 195644.jpg (70.39 KiB) Viewed 6682 times

Capture d’écran 2025-12-31 195741.jpg (23.52 KiB) Viewed 6682 times

So the Iridium one is shorter than the platinium one of 1mm if, the NGK website said the truth.

[2226]

Also visually shorter on the exposed part below the threads, but both are 13 exposed thread in each photo.
The platinum has a more shrouded tip compared to the iridium.

So anyway, I went to dig up the OEM plug I got out of my CJZD. Measured with caliper from base of washer to end of shroud: 20mm. Threaded part of that is just 16mm long.

All looks good then. Would be interesting to try the iridium and see if I get the same results. Pricey experiment for me though.

[Le_Combattant]

Also visually shorter on the exposed part below the threads, but both are 13 exposed thread in each photo.
The platinum has a more shrouded tip compared to the iridium.

So anyway, I went to dig up the OEM plug I got out of my CJZD. Measured with caliper from base of washer to end of shroud: 20mm. Threaded part of that is just 16mm long.

All looks good then. Would be interesting to try the iridium and see if I get the same results. Pricey experiment for me though.

We are agree that the sparks plugs you have on your CJZD are the 04E905601B ?

So, in this case, the iridium could be installed.

The "reach" lenght is indicated as following:

Anatomy_Reach.png (12.6 KiB) Viewed 6665 times

[Le_Combattant]

Before all.....

Happy New Year ! Enjoy 2026 with your friends, familly and...of course, your Polo

Here are the main sparks plugs we were talking about:

Capture d’écran 2026-01-01 142310.jpg (115.77 KiB) Viewed 6631 times

For wathever reason, this website (https://www.ngkpartfinder.co.uk/catalog ... POLO/2015/), indicate the "95463" for the CJZD
which is the same engine as CJZC.

But in both case, it"s indicated that both 95463 and 93231 are replacable by 94224

Capture d’écran 2026-01-01 141416.jpg (27.13 KiB) Viewed 6631 times

Capture d’écran 2026-01-01 141439.jpg (23.58 KiB) Viewed 6631 times

[RUM4MO]

First - Happy New Year to you all!

Just one comment/observation, typically "Platinum" spark plugs in VW Group world, have an expected service life of roughly 60,000miles and are cheaper than "Iridium" spark plugs. "Iridium" spark plugs have an expected service life of roughly 90,000miles and are more expensive than "Platinum" spark plugs.

Okay, for the customer, Iridium spark plugs should work out being cheaper once the labour cost is included.

The previous versions of these small TSI engines, ie the "8 valve" chain cam driven ones, I think, used to get fitted with the more expensive "Iridium" spark plugs.

Edit:- "For wathever reason, this website (https://www.ngkpartfinder.co.uk/catalog ... POLO/2015/), indicate the "95463" for the CJZD
which is the same engine as CJZC." Yes, even sillier is, I think if you checked that website for SEAT Ibiza 1.2TSI CJZD and/or Skoda Fabia 1.2TSI CJZD, you would probably find that both the CJZC and CJZD used the same 93231 spark plug.

[2226]

We are agree that the sparks plugs you have on your CJZD are the 04E905601B ?

Yes, they were B.

So, in this case, the iridium could be installed.

Would assume so then.

The "reach" lenght is indicated as following:
Anatomy_Reach.png

Everyone has different interpretation it seems.
In this case, it measures 18mm on the B plug I have.

[Le_Combattant]

First - Happy New Year to you all!

Just one comment/observation, typically "Platinum" spark plugs in VW Group world, have an expected service life of roughly 60,000miles and are cheaper than "Iridium" spark plugs. "Iridium" spark plugs have an expected service life of roughly 90,000miles and are more expensive than "Platinum" spark plugs.

Okay, for the customer, Iridium spark plugs should work out being cheaper once the labour cost is included.

The previous versions of these small TSI engines, ie the "8 valve" chain cam driven ones, I think, used to get fitted with the more expensive "Iridium" spark plugs.

Edit:- "For wathever reason, this website (https://www.ngkpartfinder.co.uk/catalog ... POLO/2015/), indicate the "95463" for the CJZD
which is the same engine as CJZC." Yes, even sillier is, I think if you checked that website for SEAT Ibiza 1.2TSI CJZD and/or Skoda Fabia 1.2TSI CJZD, you would probably find that both the CJZC and CJZD used the same 93231 spark plug.

Yup you are right.

On the SEAT Ibiza, both CJZC and CJZD are indicated to used 93231 sparks plugs (with 94224 upgrades).
Same for the Ibiza.

It's a fuc***** mess there.

[scissa]

Happy new year for all I wish you will have trouble free year!

Now, if we check the prefixes of 1.0 N/A, 1.0 TSI (which is based on 1.0 N/A), 1.2 TSI and 1.4 TSI EA211 engine families, it is all "04E".
The newer 1.5 TSI uses "05E" prefix. So i made a confusion by writing 1.5 TSI too, sorry about that.

Many parts of "04E" engines were designed and used together. So this can be applied to the 1.4TSI EA211 too.

If we check the parts number again, we can find NGK 94968 too, which is exactly the same as 95463 and 93231, i have no idea why they use different part number.

Anyway, i guess there is no way to understand really what happened. I am just gonna post the pics of the old plugs. They actually costed 50% less than the platinum ones. I guess mostly because old 1.2 1.4 tsi engine parts are being discontinued and 1.0 sells as brand new.

sp1.jpeg (227.6 KiB) Viewed 6594 times

sp2.jpeg (263.12 KiB) Viewed 6594 times

sp3.jpeg (203.28 KiB) Viewed 6594 times

I think these spark plugs are VAG specific. So, there is no other choice but to buy newer 1.0 TSI plugs for these engines or stick to service original platinum ones.

The image shows the Golf7 EA211 engine spark plug list, which all of them use the same plugs except few of them which i guess operate with natural gas.

Unbenannt.JPG (37.17 KiB) Viewed 6594 times

I made 1100 kilometers few days ago and even at this cold weather with -2 degrees celsius average, avg. consumption was 5.3 mildly urban. Previously i made 5.8 with same avg. speed.

The old plugs were still fine but you can feel the difference while leaving the clutch and pressing the gas for sure. There were no misfires before the change, but total misfires were around for cy1,2,3,4, were 25k, 35k, 28k, 25k.
I am not sure why the 2nd cylinder has more misfires. Maybe the knock sensor might located on top of it but i have no idea. Thank god the engine is not burning any oil.

Now i just realised i used VW 50500 oil (MOTUL 8100 X-CLEAN EFE 5W-30), instead of using 50400/50700 (MOTUL 8100 X-CLEAN+ 5W-30) by mistake
As you know, these engines really rattle while cold starting and you can tell the quality of the oil by the duration and loudness of this noise.
The best noise with little to no knock happened with motul like 5 years ago. Now, the outside temperature is around 0 to -10 degrees celcius and the car starts a lot less rattly than before but it is not completely gone. I think this is because the weather.
AI tells me the EFE oil does contain more sulfur which might damage the cat. converter in long term.
I am not pushing the car to the limit and the old oil still shiny when examined.

I don't think anything happen because of wrong oil certificate selection but i wonder the affect on the noise. I wonder your comments about this.

I want to share the upgrades and retrofits that i made but it is currently -10 degrees celsius outside now I will do it when possible.