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post #1 of (permalink) Old 11th August 2009 Thread Starter
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Question Laguna limp mode & fuel injection warning

Hi all.

I am the unfortunate owner of a Lag 2 1.9 dci who has been battling with the notorious fuel inhection fault warning and limp home mode issue.
The engine seems to have a hiccup after throttle is applied or released at high revs and then limp mode kicks in. It is fine while on a consistent speed.

This episode began immediately after I had both front wishbones replaced. I had the ecu codes read at a Renault specialist which showed:
- pre heater plug circuit - cancelled
- inlet air circuit - cancelled
- pre heater unit control circuit - could not cancel
I was advised that it could be egr , MAF sensor or Boost pressure sensor.

So I had egr cleaned which appeared to fix the problem as I didnt experience the symptoms I mentioned for a couple of weeks. Over the following weeks the problem has become more frequent. A code read by AA technician revealed no bad codes. So I now parted with 80 for a new EGR valve and had it fitted. Incidently the garage who fitted the egr didnt beliveve that it had previously been cleaned as it was so badly sooted. When I went back to the original garage who I had commisioned to clean the egr he was insistent that there is an underlying problem that is sooting out the egr . I think the suggestion is an imbalance in the fuel/air ratio as heavy soot in the exhaust gas represents unburned fuel (a rich mixture). I dont know who to believe.

Anyways, replacing the egr hasnt fixed the problem as the symptoms have persisted.

I am now anxious about parting more money without proper diagnosis. Where do I go from here? Can the sensors be tested for proper functioning?
Currently in dci_drab's garage:
2001 Renault Laguna II 1.9dCi
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