Very Intermittent P2270
#1
CF Beginner
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My van (2012 Express 4.3L) threw a P2270 code the other day (bank 1 sensor 2 lean). I reset it and it has not returned after a couple days of driving around. Same thing happed about 18 months ago. Has anyone else experienced this kind of behavior? Unfortunately I only have a cheap scanner than doesn't provide any real time data.
#2
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monitor the fuel trim for both banks at idle and underload when accelerating. if both banks are lean at idle...but ok under load...check for a vacuum leak. if ok at idle but lean underload....check the fuel pressure.
if only bank 1 is lean...replace that 02 sensor b1s2
lean fuel trim would show up at a % reading over 15%
if only bank 1 is lean...replace that 02 sensor b1s2
lean fuel trim would show up at a % reading over 15%
Last edited by tech2; July 31st, 2021 at 2:37 AM.
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Uncle Rico (July 31st, 2021)
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