After a few weeks P0401 showed up.
Prior to both codes the EGR valve was replaced. Vacuum leak test with brake cleaner showed no major leaks. No immediately visible exhaust leaks.
On a cold start, engine typically revs up to 2000 rpm with no gas input
I suspected a dirty intake, clogged EGR pathway, or even messed up MAP sensor. But I haven't looked into it yet.
Few weeks later, P0137 code shows up
Internet says:
P2177: Engine lean off idle
P0401: Insufficient EGR flow
P0137: Heated o2 sensor low voltage
Please advise.
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Wednesday, August 28th, 2024 AT 6:06 PM