Bought used at 110k 3 years ago, now 160k. Long term San Francisco mechanic and helpers don’t speak the most understandable English but charge low rates. Brought in to check codes etc. They said engine only had half quart of oil left!? (4.8k after last change). None of the oil change shops before had said anything about low oil so this seems out of the blue. Had heard something like radiator fan hitting something the last 4-5 days. For last 2 months had heard loose exhaust type noise I thought, apparently loose heat shield. Car sat idle all of September, since then one trip to Crater lake the only big trip besides some up and down the peninsula and daily cross-town.
Engine check light codes on bill read “P0440, P0441, P0442 EVAP Small leak” and “P0171 lean mixture” (last two fill-ups I topped off tank too much and ran a bit of fuel down the side, say 100 ml ~ 1/4 cup). After resetting it seems both canister and air sensor codes came back within days (he did not say which codes came back but I infer at least one from canister and at least one from air sensor). Mechanic said something about canister problem might be causing the air sensor code. Said canister should be replaced by Feb so system could equilibrate and smog check would work in August. I think mechanic is now saying air sensor has to be changed also…I guess because canister code did not come up by itself?
Check Engine light came back on next day.
So my questions are:
Do I have to get new vapor canister (~$600, could it just evaporate back to ok status? By Spring? I think mechanic said stuff inside has melted due to topping off spill)?
Do I have to change out air sensor?
What’s with the sudden loss of oil and is it connected to anything else? Have not noticed any oil on ground.
What questions should I ask to get clearer answer?