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(Post Link) post #1 of 4 Old 30-10-06 Thread Starter
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Hmmm ECU light

The ECU light came on in my 2002 156 JTS Selespeed after going over a speed hump. Code showed speed sensor error and was reset by my local Alfa specialist. Came on again after 500 miles or so, including two episodes of the flashing light and continued warning bleep (both of which were resolved by switching off, waiting and restarting). Reset by Alfa specialist again, who found "no codes". Almost immediately the light reilluminated. Car still ran OK, with only a slight misfire under load. I've booked the car back in for another check tomorrow, but yesterday morning the light extinguished itself, after a couple of hours parked in the sun.

Has anyone had a similar experience? Was there an easy fix? Is the car pining for a Milanese climate?

Will the ECU have retained any code relating to the last episode, or is it pointless to take it in again tomorrow?


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Re: ECU light

anyone help Jerry out ?

all the best

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Re: ECU light

if the engine light is not on it is most likely the ECU has not retained the codes im afraid.

sounds very unusual how it is just comming and going.

you say the garage said it was traced to a speed sensor error? did they inspect the sensor or replace it? it could be that it is failing and the varying temperature matched to sudden shocks of hitting speed bumps is accelerating its failure. a failed engine speed sensor would also explain the misfires you have experienced.

best of luck mate.
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(Post Link) post #4 of 4 Old 31-10-06 Thread Starter
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Re: ECU light

Thanks for your advice. AFAIK, they simply cleared the code. I wasn't clear whether it was a road speed or an engine speed sensor error that was recorded, but I'll clarify that later today.

Searching the forum, it seems that intermittent ECU errors are quite common with these engines. I wonder whether it might be worth acquiring an EOBD reader of my own, so that I can download the codes while the light is still on?

If so, I'd be very grateful for any advice from the forum re: brand/model. There are EOBD readers from about 30 on e-bay; can they be any good at that price?

Oddly, although this car has spent more time at the garage in the eight weeks that I have owned it than my previous Saab did in eight years, I still really like it. Usually I can't stand anything that doesn't work exactly as it is supposed to.

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