Volvo Owners Club Forum - View Single Post - A guide to reading fault codes on your 1990-1993 240

Clifford Pope · Dec 30th, 2012, 09:33

I didn't notice it was an old article, and I had already commented on it

But I would add that the light can be triggered by a momentary fault or a passing glitch. It doesn't necessarily mean there is still a fault to be found.

I once went over a shower of pebbles on a gravel car park. One must have hit the engine block hard enough to trigger the knock sensor. The lambda light came on and the engine felt a bit odd. I guessed what had happened and cancelled the codes, and it was then fine.

In my experience it's always worth noting the codes, then just resetting and seeing what happens, before getting too worried about tracing faults that aren't real.

Dec 30th, 2012, 09:33	#9
Clifford Pope Not an expert but ... Last Online: Today 17:33 Join Date: Dec 2001 Location: Boncath	I didn't notice it was an old article, and I had already commented on it But I would add that the light can be triggered by a momentary fault or a passing glitch. It doesn't necessarily mean there is still a fault to be found. I once went over a shower of pebbles on a gravel car park. One must have hit the engine block hard enough to trigger the knock sensor. The lambda light came on and the engine felt a bit odd. I guessed what had happened and cancelled the codes, and it was then fine. In my experience it's always worth noting the codes, then just resetting and seeing what happens, before getting too worried about tracing faults that aren't real.