Hi all. Re. the Vibe/Matrix in my signature, 2AZ-FE 2.4L engine. I've posted about this before, but it still isn't resolved and I'm confident it's a MAF sensor issue now. I'm on my second MAF in about two years. The first one was a Denso first time fit and the second (current) one is OEM Toyota/Denso. I've had the same problem with both. I'll either get a MAF sensor range code, a p0420 code, a lean code, or combination of those fairly regularly. Whenever I check my long term fuel trim, it's always way off lean or rich (been consistently running rich/negative lately.) However, when I remove the MAF and spray it clean (which I've done at least 20-30 times for each) the LTFT returns to normal and the codes clear up. The problem is this only lasts a day or two on average. Once it was fine for about two months, but lately it's been a problem every other day. I've tried different air filter brands (Toyota, Denso FTF, Fram Ultra, Purolator One, Mahle currently) in an effort to diagnose this problem but they don't seem to make any difference. I did read that some MAF sensors are self-cleaning to an extent by getting hot, but I can't determine if that applies to mine or not. I really shouldn't have to include cleaning my MAF everyday as part of routine maintenance, but does anyone have any ideas as to why it works or what else I can check? I'm at a loss.
Much appreciated,
Jonas
Much appreciated,
Jonas