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Hi everyone. So I had a CEL w/P1167 code on my 02 Accord 4-cyl 190,000 miles. Idle was rough and RPM’s would dip low. Did some research and this most commonly meant the pre-cat O2 sensor was toast. I replaced it with the correct Denso part as spec’d on their website since these ULEV engines are very picky about which sensor to use. CEL’s now gone, RPM’s are solid but the idle still isn’t as smooth as it used to be. I feel vibrations in the steering wheel and dashboard and there is this faint groaning/moaning from the engine. Vibrations oddly seem to be worse when in park. Before the CEL coming on, the car never did this before. Spark plugs are NGK plats and not that old. Front engine mount is OEM Honda about 1 yr old. Car still pulls strong without any hesitation. I unplugged the battery for an hour hoping an ECU reset would help; no change unfortunately.
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