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Same problem, getting an OBDII read stating O2 Sensor Circuit Bank 2 Sensor 1. The check engine light comes on about 20-80 miles then we reset it. Doing OBDII data read for about 5 miles shows the sensor stating present then flicking to not present once in awhile. This just started about 500 miles ago, right after the dealership changed the Timing belt. Could this be a loose wire from their workmanship? We are afraid to take back to this dealership due to the problems with the mechanics.

When we got the car back, the air box wasn't even connected. They had forgot to clamp the intake and ex take hoses. Bolts missing, Wires/cables not being clamped in.

Again, could this be a wire or faulty install or should I just replace the o2 sensor?
 

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software states:

Trouble Codes: P0150
O2 Sensor Circuit Bank 2 Sensor 1

When data viewing for 5 minutes of drive time. The software log shows that same o2 sensor showing present, then not present, Like a loose wire or maybe this is how it starts failing?
 
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