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Old 09-18-2021, 03:32 PM   #58
jrhudson
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Join Date: Apr 2021
Drives: 2016 scion frs
Location: ca
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Quote:
Originally Posted by FR-S2GT86 View Post
Yes, just the connector on the front, left side of the engine. This should tell the ECU that your upstream O2 sensor is at fault and should default to a base map so that the engine will run (probably in limp mode) but this should also turn your check engine light on and (maybe) allow it to run for a little while.

See these pictures here,

Attachment 205340

Attachment 205341

The upstream sensor is the one on the right side that the red arrow is pointing to in the second picture.

Thanks. Ive tried that but im assuming im doing to check if the car fuel is still lean? It does startup fine without the upstream o2 sensor plugged in. Post cel P0031 - HO2S Heater Control Circuit Low Bank 1 Sensor 1

She also fires up just fine without the MAF connected.
Just like when the car fires up without the MAF, both LTFT and STFT show no data for startup without upstream o2 but i was running for under 20 seconds.


https://datazap.me/u/jrhudson/cold-s...?log=0&data=28

1st log is with everything plugged in. she dies. I just do this for every 1st start of the day. 2nd is with the upstream o2 unplugged
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