Hi,

 

Have a vrs se so use this site normally, I also have a 2003 polo which is similar to the fabia and I believe the 1.4 fsi engine in my polo is the same as the one in my dads 1.4 fabia, so hopefully i don't upset anyone by posting this in here

 

I have a VW Polo 2003 1.4 FSI petrol at approx. 120K

Yesterday the engine warning light came on and I checked the faults today.

P0118 COOLANT TEMP SENSOR G62 SIGNAL TOO HIGH INTERMITTENT
P1403 EGR SYSTEM LIMIT VALVE DIFFERENT


I cleared the faults, the light went off although the temp fault is still present and the erg valve is still whirring (see below). Driven the car around, no engine light back on as of yet.

There appears to be two, two pin temp sensors. One in the bottom of the rad and one on the side of the engine near the erg valve. Since I have owned the car, 2012, the rad fan has intermittently run even when the engine is stone cold, so am I correct the rad sensor is the sensor to be looking at first? The temp gauge within the car has always worked correctly.





Had a look around the erg valve. All the pipe works looks ok, although I noticed even though the fault was cleared, that with the ignition on but engine off, the erg valve solenoid is constantly working (whirring). Would taking the erg valve off and cleaning it out, help anything or has it gone wrong electronically / internally?



Thanks Dave

No, you need to replace both those sensors from what you say. They're not expensive, do them both.

Ok thanks, Ill order some.

 

VW wanted £32 +vat each and they are on ebay at £12 free p&p so Ill try those.

 

Had a better look at the erg valve this arvo, Took the top off with the gears in and the plastic gear has partially stripped. The valve opens and closes freely with just the resistance of the spring.

Sounds like the gear has slipped and the mechanism has now lost its positional limits which makes sense of the error code.

Hi,

 

Sorry to reopen this topic but here goes....

 

Ended up changing the whole egr valve and that solved that problem. Engine light stayed off for quite a while even though I never got around to doing the temperature sensors.

 

Now have some more faults. You can clear the lights and they come back within about 150-250 miles.

 

17441 nox sensor g295 signal too low p1033

17443 nox sensor g295 not a plausable signal p1035

16502 coolant temp sensor g62 signal too high

 

ok, temp fault, change the sensors, ill order some. hopefully solved.

 

nox sensor. Can 'i get away with just changing the sensor (03c906261) or do i need to change the control box (03c906263) also as I have been googling and it says that some models they have to be paired?

 

Will be selling the polo within the next 4 months, so don't want to spend a fortune but I also don't want to sell a car with hidden know issues. Im not that dishonest to only turn the lights out.

 

Thanks Dave

 

ps. The VRS LE is still going strong (touch wood) and its much for fun to drive :-)

Edited 19 August, 201411 yr by D4UJD

It's the post-cat lambda probe, just replace it, no pairing needed.

I don't think any Mk1 Fabia uses a nox sensor, so knowledge of them and their failure modes may be a little sparse round here.