Question about Volvo S40
At this point the only option here is to return to the dealer and have the system scanned for trouble codes stored in memory of central computer module, there will be codes in memory, without this info u are just guessing and guessing on this car is very expensive. I base this advice on 40 years as a professional car technical work. Also the check engine light means possible emission system problems, this is covered by the extended emission warranty which goes to 70,000 miles on most cars.
Posted on Jun 14, 2009
Getting the light out is not much of a problem, however you are being told something in the emmissions system has a problem, which could affect mileage and in certain instances can cause damage to other components in the system.
Under your steering column and at the bottom part of the dash, you will see a black connector with numerous holes (pins). The code reader will plug in there.
Go to your local parts store and ask for a GM code reader. These things are pretty cheap these days. Inside the package should be a description of what the codes mean. Just an example would be a code for a bad O2 sensor. You would change the sensor, clear the code and the engine should run properly.
The error codes are general symptoms and can mean many things. If you just try to get the light off, this is only a very temporary fix and it will come right back on until you fix what is setting the light off.
Posted on Jun 14, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
The PCM, see important above
Important: This procedure is not available on vehicles equipped with option code (Z49).
If replacing a BCM with an GM SPO Replacement Part, perform the procedure to setup a new BCM prior to the 30-minute relearn procedure.
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