C5 1.6Hdi Depollution Fault

[MichaelDavis]

Drove 65miles down motorway no problem, on return home after a 50mph speed limit due to roadworks pressed cruise control to accelerate to 70 and depollution fault came on display. I've tried driving in lower gear to get revs up to 4k for some distance still fault plus engine light on, I've disconnected battery for an hour fault comes on straight away so tried driving motorway speed in low gear still no effect. I only use premium fuel, car is extremely well looked after service wise. Only thing that's been changed recently is cambelt and water pump along with replacement Valeo EGR - old one was actually perfect except the fixing bolt s had worked loose so it was blowing slightly from the gasket - I'd bought the new one as egr valves usually don't last forever and i had been having a symptom which was pointing towards a faulty egr. I had new turbo and oil feed pipe fitted last year and looking at the oil feed pipe today it's covered in black soot along with the turbo casing too but the original never looked like this so i don't know if there is an exhaust leak from the turbo or if it's normal. If anyone has any ideas what's caused the depolution fault I'm all ears. Car drives but feels a little sluggish - it was sluggish after new cambelt but not all the time just odd days again don't know why.

[Randombloke]

Only thing that's been changed recently is cambelt and water pump along with replacement Valeo EGR - old one was actually perfect except the fixing bolt s had worked loose so it was blowing slightly from the gasket - I'd bought the new one as egr valves usually don't last forever and i had been having a symptom which was pointing towards a faulty egr. I had new turbo and oil feed pipe fitted last year and looking at the oil feed pipe today it's covered in black soot along with the turbo casing too but the original never looked like this so i don't know if there is an exhaust leak from the turbo or if it's normal. If anyone has any ideas what's caused the depolution fault I'm all ears. Car drives but feels a little sluggish - it was sluggish after new cambelt but not all the time just odd days again don't know why.

 

Did you have the new EGR valve coded into the car? If not, that might be the sort of the fault code.

 

If you have an Android phone, buy a EOBD II to Bluetooth plug, load Torque Lite and read the code, or find someone who has a code reader.

 

The code will tell you whether is the DPF or the EGR. If it's the EGR, you'll need to find someone with the full Monty diagnostic to code it in.

 

Had the same problem when I swapped a faulty EGR on a 2.0 C5 Tourer.

[MichaelDavis]

Well strangely after switching on the engine for the fourth time since the depollution fault showed - the fault and engine light have cleared. I think I'm going to have a word with my mechanic to see about the egr coding and see if any codes have been recorded on ECU.

[paul.h]

Code readers do not cost much and are a lot cheaper than paying somebody to read a fault code. If you do buy one get one that does engine live data since it will be more useful. Or you can spend a bit more and get a Chinese Lexia copy to put on a lap top. As an example https://www.gendan.co.uk/product_FXNT200.html

[MichaelDavis]

Thanks for info Paul.