CEL on - WTF?
Ok, i recently got a CEL...code reads 1221, meaning the O2 sensor (1992 325is). So i replaced this about 4 months ago, is this normal for it to go already? the light comes and goes....i bought the bosch O2 sensor from budds BMW, so why is this happening??? Can O2 sensors go this fast? Im starting to think its the wiring, but how? How can i check all this?
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