Fault-17584

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PorkaPolo
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Fault-17584

Post by PorkaPolo »

Hi there

I have a 2002 Polo 1.4 auto.

Have an intermittent fault which is annoying and need your help. I have purchased VCDS and and have taken the faults down.

The fault I am getting is 17584 -Bank1: O2 (Lambda) Correction Behind Catalyst: Control Limit Reached P1176 - 35-10 - --Intermittent.

Sometimes the light comes on, sometimes it does not but still registers the fault.

Taken it to a VW specialist and he changed oxygen sensor in the middle of the vehicle (aware there are 2.other on Manifold) at a cost of £100. And fault still comes up. Taken it back and getting brush off.

Can anyone assist as vehicle not the best on fuel. Not sure how many miles should I get on £20 or around 17 litres?

Have also taken levels from VCDS

lambda factor 0.988 then Lambda factor 0.996

Banks 1 Sensor 2 0.642v test Off.....is this testing the new one? If so how can I check the first one?

So fed up, thinking of getting rid of the car.

Your help will be much appreciated

Regards
Nick
RUM4MO
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Re: Fault-17584

Post by RUM4MO »

You know, this confuses me, did you ask that VW indie to check the car over and sort it, or did you ask them to replace that sensor?

If you asked them just to investigate and repair, then they should not be giving you the brush off, they should have investigated why the B1 S2 Lambda sensor was finding that there was a problem, which was not necessarily due to that sensor being faulty, it might just have been correctly reporting that there was an emissions problem!

The first Lambda sensor, ie B1 S1 should control the basic mixture and with the correct mixture range being applied to that engine, the Cat should be able to clean up the emissions which is then checked by that sensor that they replaced.

That sensor that they replaced does nothing other than act as a watchdog and give warning of a dirty exhaust.

Edit:- that last sentence should be true for your engine but maybe not for all VAG engines as it seems that some do use the post Cat sensor as feedback. One other thing, if they did diagnose that correctly, but maybe have saved you some money by fitting a cheaper part than genuine VAG part!
PorkaPolo
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Re: Fault-17584

Post by PorkaPolo »

Hi there

Thank u for your reply.

I did total scan on vehicle on vcds and showed him the report.

He said it was the one behind cat.


I trusted him but evidently no not the right one.

So change the front one ? Easy diy? Any links on this ?

It's an intermittent fault. Also when it errors notice vehicle holds its revs on gear changes.
RUM4MO
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Re: Fault-17584

Post by RUM4MO »

I have replaced the front Lambda sensor on a 2002 1.4 Polo with the BBY engine, in that case the fault code pointed directly to it as it had a failed heater circuit I think. I had the Polo up in the air on ramps to replace that sensor and to make life easy I ended up buying a second open ended spanner which was different to my original one so that I could turn the sensor a few degrees with one spanner, then a bit more with the other and maybe turn them both round and repeat - as access was tight.

So, where to buy a new B1 S1 sensor, I'd definitely only buy same as VW fitted, and that will be an NTK branded one - they are part of NGK but theses sensors are branded NTK, so either buy from VW or buy NTK from a motor factor or on line. Use the NGK website parts finder to locate your one, I seem to remember that it might not list a front one for VW Polo 9N 1.4 BBY, if not use the equivalent SEAT Ibiza 6l 1.4 BBY engine version as obviously it must be the same part!

Edit:- my major fail was going out and buying a Lambda sensor removal socket with a slot in it - no space on that car to use that!
PorkaPolo
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Re: Fault-17584

Post by PorkaPolo »

Hi there

Thank you for the reply.

So you are saying change front lambda sensor and should resolve? Drinking a lot of fuel at the moment.

Also, if the mechanic changed sensor behind cat (middle of car) with not a NTK will that be an issue? Just feel I have been robbed by my mechanic.

Also, any chance to show me where the front one plugs in?

Really appreciate your help

Regards
Nick
RUM4MO
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Re: Fault-17584

Post by RUM4MO »

Trouble is, you find yourself between a rock and a hard place here! While we DIYers probably do not have the kit to probe both these Lambda sensors and make sure that, for instance, the front one is lazy or otherwise "worn out", I would expect a professional mechanic to have all these tools to hand and not just take a stab in the dark. Having said that, a proper professional mechanic with up to date training and back-up resources will charge at least £90 per hour, for a bit more than that you can buy a proper front probe.

So where is the front probe:- get the front of the car up onto ramps, take off the under skirt, look up at the exhaust manifold which is at the front side of the engine, it is not just an exhaust manifold but a manucat, ie a cat and manifold in one, the probe screws into the rear of the manucat so is between the engine block and the manucat.

This assumes that your engine is a 1.4 16V, if it is a 1.2 3 cylinder, I think that the Lambda sensor can be reached from under the bonnet facing out from the manucat conveniently through a hole in the heat shield.
PorkaPolo
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Re: Fault-17584

Post by PorkaPolo »

Hi there

Yes its a 1.4 16v Auto.

Can see it if I take the black panel above but cant figure out where it plugs into. You got a pic?

Many thanks in advance

Regards
Nick
RUM4MO
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Re: Fault-17584

Post by RUM4MO »

I don't have a picture, if you at meaning that you can't see where its wiring plugs into, I think that the wiring passes close to and the cable clips into somewhere near the manucat (from memory) also I think that the NGK online catalogue says which type of connector is on it and how long the cable is, from that you can follow the lead back from the probe/sensor to where it plugs in. I think that is what I did about 10 years ago.

Edit:- I don't remember seeing very much from above as there is a heat shield in the way and that probe/sensor sort of points straight back and slightly upwards towards the engine block.
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