My 99 Accord EX just got P0170 and P0171 codes. F23A1 motor. Tested primary o2 sensors and voltage fluctuates consistently between 0.180 and 0.840. could O2 sensor be bad? or do i want to look into checking fuel pressure regulator or the MAF sensor? CEL comes and goes.. mostly stays on. also light knocking / valve clatter when cold between 2500-4000 rpms. once motor is warmed and driven all motor noise goes away. unsure if its related
Take your MAF out and look at the inside see if it's got some fuzz around it, possibly from the air filter, this could cause lean codes to pop....just take a small straw from a brake cleaner bottle for example and lightly brush it off. clear the codes and see if they come back.........as for the engine noise it sounds like a matter of oil pressure building up...i could be wrong though
For the noise it looks like I'll need a valve adjustment.
Accord does not have a MAF.. has a MAP, which was clean. Cleaned gunk out of the EGR. now the code comes and goes, and it's started bogging down in the lower RPM's, and seems slower.. thinking a couple things could be wrong. Fuel pressure regulator/filter, cat converter (smells sulfur like).
will post back at a later time with update or solution.
If its a lean mixture code, check that you don't have any vacuum leak before the TB. And I doubt the 99 Accords have MAF sensors; instead, they have MAP.
Voltage should fluctuate from .1-.9 volt. So yours might be fine since .8v is closer to .9v.
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