Quote:
Originally Posted by airdreams1
Was pretty sure I had a leaking fuel injector. So I replaced the injectors with six remanufactured ones. The check engine light came back on again for the same code. Now I'm wondering what else might be the issue. Obviously could be the oxygen sensor or catalytic converter. Is there anything else that it could possibly be?
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In my case, an exhaust leak downstream from the cat (beyond the flange, on a self-installed exhaust system) caused the P420. Worth checking your connections beyond the second 02 sensor - you might get lucky.