euro4 Lambda and EGR DTCs

[A lex]

Il update this as a reference for others reading in the future.

To the chap who helped, thanks. To the other poster, not so much.

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The IC was completely wrecked. Blown out top and bottom, but particularly on the bottom. Only 137k km on the car, so im a bit surprised.

An 'aggressive' test drive later and I cant replicate the fault. Im knocking on wood etc here, as I appreciate there could be another problem still lurking, but I hope (please!) that is it fixed.

So, some thoughts and advice for others in the future reading this.

-ECM codes for the MAF in combi with the Ho2S sensors in 'signal too low' condition can actually mean a blown IC. I never had any DTCs for boost problems. I guess the intermittent reduction in boost was upsetting the MAF and Lambda.

-I was somewhat 'pressured' in to trying my own solutions and essentially wasting some money on sensors. To be honest I dont feel too bad about it. I now have a good spare MAF, the lambda sensor ill accept as wasted money and the MAP sensor was only €40, so no worries there.

-I asked them to use a non-genuine IC when replacing; Ive gone for Nissens which is a good quality part. Reasons being:
1. Volvo part is €500+ and isnt exactly top quality. Nissens part was €250.
2. Volvo part was one day+ delivery. Nissens was there in <1hr!

-Because I have used my local indy guy to replace im looking at about €450 for the IC work, plus the €300 I spent on unneeded sensors - so im still well under what Volvo would charge me to replace the IC in their workshop.

-Also a decent example of how a little 'knowledge' gained by using VIDA can lead you up the garden path somewhat.....!


In any case, it LOOKS like its not an ECM problem, and for that I am truly grateful. €700 in comparison to €3k+ seems like a decent escape.

Also worth mentioning that the car is now driving beautifully. I suspect the IC issues have been creeping up for a while as fuel economy has been on the slide for about 3 months. Its also a lot faster again now!

Some IC pics.

[volvo for ever]

new egr electrical unit req

[A lex]

Originally Posted by volvo for ever

new egr electrical unit req

Didnt feel tempted to read the thread then!

New IC was needed.

[5cilinder]

Originally Posted by A lex

To the chap who helped, thanks. To the other poster, not so much.

Aaaaaah thats not nice
I helped you more than your stubborn mind and servicemanager understood
Namely : Dont blindly change parts ,measure and investigate first instead reacting hastely on symptomes

Originally Posted by A lex

-Because I have used my local indy guy to replace im looking at about €450 for the IC work, plus the €300 I spent on unneeded sensors - so im still well under what Volvo would charge me to replace the IC in their workshop.

Thats some brilliant stockholmsyndrome thinking to justify your stubborn unneeded sensors (thats why i drive an old s60 instead of a expensive ferrari )
Had someone whispered to you that without the unneeded sensors its much more under what volvo would charge you?

But good that the problem is solved in the end end shared (if it stays away hopefully)