Question about 2004 Oldsmobile Alero

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Engine codes on after motor swap

I have a 2002 alero, which just recieved a brand new crate motor install... it has the 2.2 eco tech.... the service engine light is on... change oil... and traction light.... these lights were never on before the motor change... can i clear them myself... i have put the portable obd2 scanner on the plug and it says no codes found

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It sounds like there is a couple of plugs in an underhood wiring harness that didn't get plugged back together, or there is a wire that got pinched under a bolt or other piece of hardware. If you paid a shop to do the work have them make it good. If you done your own, have a friend that is familiar with the car take a look for what I mentioned above. You can look for yourself, but in your mind it's right and that can be hard to overcome. That's the reason fresh eyes are better for this.

Posted on Dec 17, 2008

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You may need to get the computer re-coded by the factory. I've had this happen with newer engine swaps, sometimes the computer doesn't recognise the new engine. Also double check all your plugs and sensors, make sure they're hooked up and tight. There is also a "drive cycle" the vehicle needs to go through after the battery has been disconnected, or the codes reset before the computer will link up to the scanner, usualy anywhere from 50 miles to 150 miles.
Hope this helps!

Posted on Dec 17, 2008

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