Quote:
Originally Posted by shadow247
I get a random P0420 when running in 4Lo for extending periods.
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Mine does it sometimes if you idle in traffic (moving, foot rarely on brake, never on the gas) for 10+ minutes. Very low load while moving is what does it. I just installed new F&R AFR/O2 sensors but haven't taken it in traffic enough to see if its fixed.
I would otherwise never throw any codes, LT and ST trims good (0 +/- 3%) and blows clean on the smog rollers (99 and earlier still have do tailpipe tests in CA).
I don't know if I've ever cleaned the MAF, so that's an idea for improvement too. I always run a quality paper filter for max filtration.
-Charlie
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'99 4Runner SR5 Auto -
4WD swapped
'89 Camry Alltrac LE 3S-GTE 5spd
'17 Chevy Volt Premier
'16 Honda Odyssey Elite
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