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Old 02-19-2017, 04:53 PM   #1
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P0140 Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 2) Help

Hey Guys,

Just got this code and was wondering if anyone had some advice as to what to check or look for. Possible causes?

Some back ground on the Vehicle.

13 BRZ with about 78K on it.

Recently installed OFH and flashed stage 2 about 4-500 miles ago.

Car started kind of funny and had the CEL come on. After a short drive i checked the code using my OFT and it said no codes showing.

Reset my battery, drove to the store and back no CEL

Went out later on, started driving, light came back on, stopped checked code, got P0140 as shown in the description. cleared code, hasnt come back on yet.

Im wondering if its possibly a bad 02 sensor? It seems the code is saying it not detecting the sensor.


Any thoughts would be great.
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Old 02-01-2018, 02:48 PM   #2
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Does anyone have an answer? Also looking into the same issue. Thanks!
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Old 02-01-2018, 03:14 PM   #3
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Have either of you checked to make sure the sensor wires and intact and connected properly to the harness? Any other mechanical updates in either case before the issues started?
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