check engine light

Asked by Mar 24, 2013 at 03:31 PM about the 2001 Volvo S40

Question type: Maintenance & Repair

What are possible causes for this. O2 sensor?

4 Answers

3,460

Bad or loose gas cap common cause

79,125

What trouble code do you have? -Jim

2 people found this helpful.

You've overfilled your gas tank drowning the charcoal canister forcing the computer to not sense any back pressure, and not able to purge correctly- couple of months with this and the "black tape" solution would be okay, but we'd have to know that this was the only reason.

1 people found this helpful.
107,705

There are around one thousand engine trouble codes. It could be anything. Get the codes read, write down the number and post it.

1 people found this helpful.

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