I am getting rpm sensor code on the OBD on my 93 940 turbo. There are no signs of a failed sensor though. Car runs fine, though with the occasionall ping. No stalling. Could the code be wrong?

Dear Anthony,

May this find you well. The OBD system may detect a signal fluctuation that is not yet large enough to disrupt things. You might buy a replacement sensor. Once you have it, gently wiggle the wiring harness. If the engine stops, replace the sensor, as it is going to fail. Soon.

If the crank / RPM sensor is the factory original, it doesn't owe you a nickle. You'll either change it at a time and place of your choosing, or you'll change it at a time and place not of your choosing.

I'd guess the OBD is giving you an early warning. I'll be interested to see if anyone else has found this code to be phoney.

Hope this helps.

Yours faithfully,

Spook

I had this OBD code in my 1990 245 with a brand new crank sensor (like a week old), swapped it with the equally new one in our 740, cleared the codes, everything was fine. Both cars are happy. No codes in either.

The original poster can try clearing the codes to see if it comes back, though I agree with Spook: if it's original, replace it... soon.

-Ryan
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Athens, Ohio
1987 245 DL 314k, Dog-mobile
1990 245 DL 134k M47, E-codes, GT Sway Bars
1991 745 GL 295k, Regina, 23/21mm Turbo Sway Bars
Buckeye Volvo Club