exhaust emission light help?

Jay_6n2 · Post by **Jay_6n2** » Tue Aug 26, 2008 11:36 pm

Hi guys

just after a bit of help

bought a polo 1.4 75bhp 16v 6n2

when i bought it , on way home emission light came on and car went into what feels like safety mode.. i took it back, by time i got back problem cleared up, garage checked the fault and appeared to be a missfire on cylinder 1 , plugs where changed fault then went and off i went a happy chap..

ive had the car three weeks now and the problem has happend once a week ago, cleared up then straight away, but now its more consistent and seems to be every other day, the light will flash, i will leave the car and then the light stays on solid, then overnight the light goes out completley.

i have had a look through my cars history, which is all main dealer...

the previous owner reported a problem to vw on 11/10/2007 of rough running. the print out advises..

carried out investigation into rough running. Checked fault memory, Misfire on cylinder 1&2 , alo when testing water pump not working,

Garage then replaces spark leads & water pump.

Previous owner then went back to vw on 29/10/2007 complaining of rough running again, print out this time advises

carried out investigation into rough running, Ok t time of tests but is intermitant fault. Was No 1 & No 2 cylinders last time. Checked compressions - all are different, 3 bar difference is limit - See print ( no print attached ) maybe valves not seated will let problem develop..

I have also noticed that the previous owner had a new lamnbda sensor and lead set on 03/08/3007 , seems strange they had two sets of leads in 2 months?

I have nothing further since then, although this work was 10 months ago so surley there can of been a major problem..

The car runs absolutley sweet apart from then the light flashes.. Starting to worry me a bit now..

Does anyone have any ideas??

Thanks

Jay

xcore · Post by **xcore** » Wed Aug 27, 2008 9:54 pm

EGR valve probly

happened on my got it sorted through warrenty

DanOliver · Post by **DanOliver** » Thu Aug 28, 2008 5:32 pm

I doubt it.. My EGR Valve went.. and mine didn't go into "Safety Mode" Although it did do all the flashing on and off of the engine check light..

I found that mine would clear the faults over night.. that was when it was only intermittent and was not being logged in the ECU. When the problem got worse the light never went off.. was permanently on and it was logged on the ECU with two faults for the EGR Valve..

It reported like this;

2 Faults Found:
17811 - EGR System: Regulation Divergence
P1403 - 35-00 - -
16785 - EGR System: Insufficient Flow
P0401 - 35-00 - -
Readiness: 0010 0101

If you can get hold of a VAG-COM cable and have a look then it might indicate what the fault is.. unless its the cylinders again.. which is a bit odd and I wouldn't have a clue as to the problem.. could be anything??

Jay_6n2 · Post by **Jay_6n2** » Thu Aug 28, 2008 11:19 pm

well the lights been out since i have posted this, touch wood, could it be rough fuel?? i know the above doesnt look promising ( the work done ) but that was almost twelve months ago

DanOliver · Post by **DanOliver** » Thu Aug 28, 2008 11:26 pm

It shouldn't keep happening though surely :S maybe something somewhere is clogged? or the ECU isn't controlling things as it should? Don't really know..

Hopefully someone who is a mechanic will be able to answer

Jay_6n2 · Post by **Jay_6n2** » Sat Aug 30, 2008 12:25 pm

yeh my neighbour is a mechanic and he dont get it, im going to order a vagcom cable in case it happens again

jordydave · Post by **jordydave** » Wed Sep 03, 2008 7:00 pm

I've had the exact same problem with mine over the past 12months. Had it checked out by 3 different garages who hooked up the diagnostic software and had 3 different diagnostis;

1st - Llambda probes - I didnt agree with this as the engine was running fine, so I took it elswhere

2nd - Faulty Speed Sensor?? Not sure where that came from but they wanted to charge Â£150 to fix, NO WAY

3rd - Faulty Temperature sensor, was replaced for Â£10 and the engine management reset. This solved the problem for a couple of months, then it came back.

Not sure what to do now, seems like this could go on forever and bleed money from me without fixing anything.

Is this only a problem with the 02/03 models?

Jay_6n2 · Post by **Jay_6n2** » Wed Sep 03, 2008 7:02 pm

well mines a 2001 so i think its further spread... mine has gone off now , seems to be after long journeys like day after it happens. when sat in traffic