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05 almera 1.8 auto, very low mileage, 16,000 in nearly 8 years, drives good, plenty of power, idles smoothly, but waiting at lights idle can go down to 600rpm then engine light comes on when you drive off.
my scanner says P0171 code on its own - lean mixture, but it has high positive fuel trims and spark plugs were sooty which means rich mixture, so is that a bad o2 sensor not working correctly, and if so which brand should i put in a uk almera. thanks in advance
It passed its MOT emissions test 2 weeks ago easily so it seemed a bit odd that the sensor would go bad so quickly after the test.
Anyway, better get myself a slotted socket. Have you changed many of these yourself?
am waiting to receive items, socket and sensor, i'll let you know if it's successful or not
Just fitted the new sensor, drove it for 20 miles, plugged my scanner in and everything is fine, fuel trims back to zero etc, so it was the sensor after all.