Question about 1996 Chevrolet Cavalier

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My check engine light code 0040 the mechanic did repairs and told me drive 50 miles and the light should go off

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And did the light go off ?as this can be done otherwise with a authorised dealer who can reset but here it resets once the sensors detects good consistent readings ..So drive the 50 miles.

Posted on Sep 28, 2010

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CODE 40 IS POWER STEERING PRESSURE SWITCH CIRCUIT.WELL YOU CAN DISCONNECT NEGATIVE BATTERY FOR 1 MINUTE IT WILL ERASE CODE YOU HAVE THE OBD I PCM SYSTEM BUT FIRST.TURN OFF RADIO FIRST BEFORE DISCONNECTING BATTERY CABLE.IF LIGHT STILL STAYS ON YOUR PROBLEM STILL EXIST.

Posted on Sep 28, 2010

Why did they not clear the code?
My guess is,they replaced an O2 Sensor ,based on a code. It wasn't the problem, and now the light is on again,and you can start over,and diagnose it properly.

Posted on Sep 28, 2010

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Hi, the code needs to be erased, by dealer or local auto parts that has scanner. the cars computer still thinks the part has been changed.till the memory is reset . and then it, run full diagnostics test with out errors. thanks hope i been some help.

Posted on Sep 28, 2010

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