fault codes deleted after unpluging coil packs - Alfa Romeo Forum
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fault codes deleted after unpluging coil packs

I used to get fault codes p0170 and p0130, lambda related. Then I tested unpluging coil paks 3 and 4 that run the small spark plugs on my 1.8 TS CF2 engine. Cleared the errors, car runs fine, and now I don't get the codes displayed anymore. Could the faults be related with damaged coil packs? Spark plugs are brand new. I'm still getting p1653 and p1172 fault codes like I used to.
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