carnewbieCommunity MemberMay 3, 2022 at 8:21 pm
Recently my car started burning engine oil and throwing p0420 error, current odometer reading is at 262k miles. Initially I thought it was O2 sensor and catalytic convertor, I was planning to change them both…by accident I found out that when I open both the engine and gas tank cap, the check engine light disappears, it stayed like that for about 400 miles and came back on after that. I kept on doing the little trick from the last 3000 miles, and read on one of the forums that pcv can cause that, I went ahead and replaced it, but the check engine light came back on. Now I am curious to find out what’s causing the check engine light. Do you guys ever come across this issue before, if so can you please let me know what you did to fix this?
Thank you in advance!!!
Engine: 4 cylinder 2.4lMSelleenAdministratorMay 5, 2022 at 6:57 pm
Hmm sounds strange because these things are usually not related, could maybe cause the ECM to recheck the values. But check the EVAP lines and other vacuum hoses to ensure there are no leaks. I would also test a catalytic converter cleaner in the tank and diagnose the catalytic converter properly before replacing itMarkDoroninCommunity MemberMay 30, 2022 at 3:11 pm
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