I think I'm going to +1 on the MAF.
Been chasing some quirks for months and I read a clue that when long term fuel trim is opposite polarity of short term it's likely MAF related. I swapped mine and wife's MAF and my O2 readings started behaving better and within a few days she got a similar error I've been chasing on mine. I just ordered a new Siemens MAF from eBay for under $90 I'll report back if it shows up and not actual Siemens brand |
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I'm sure there's no harm in putting a new MAF on. I think I'll try that. It's 144,000 miles now so I'm sure it's something that will need replacing sooner or later anyway. |
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