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Hi guys....had a bad batch of fuel that brought up the engine light on a 2010 Mazda 3 Neo 2L.

Error code was p2096 and car runs fine. Used the bad fuel up as directed & put a bottle of fuel additive...then once run low I put 1/2 tank with high octane BP fuel and code came back few hours later.

Got told it was same error and to go to empty again and put a full tank...so did that and still p2096 error and advised faulty rear o2 sensor.

Changed rear sensor and now I still get p2096 and p2096p from my cheap obd2. It also comes up with p0138...

How can the rear sensor be crap when it's new and the car runs fine...I noticed driving after erase code is fine but once off for 15-20mins engine light appears with these codes 10mins later???

Please help...one guy told me both front & back sensors should be changed but all the others said that's BS
Vehicle: Mazda 3 - 2010 Neo 2L

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P2096 Target A/F (airfuel ratio) feedback system too lean

P0138 H02S circuit high input Bank 1 Sensor 2

With P0138 this mean there is a improper connection for P0138 , Circuit high  happens when there is a failed connection look at the connection of sensor 2 is it plug in, nothing interfering with it, you have a bad connection with sensor  2 which is the downstream or catalytic monitor sensor, What the ECM looks for is open circuit, short circuits, grounds ,rationality, and this will code right away, 10 to 15  minutes or even less.  As for P2096 this is a condition of the engine not a sensor, There no exhaust leak prior to the upstream 02 sensor ? no MAF (mass airflow) air duct leak,  Mazda produced a TSB about P2096 code condition, TSB # 01-024/13 titled MIL on P2096 set. What the TSB talk about is to reprogram the PCM, Just to let you know your bad gas has nothing to do with P2096 setting, Unfortunately this code condition has already been a problem, Here a sample article:

BULLETIN NOTE

APPLICABLE MODEL(S)/VINS
2010 Mazda3 with 2.0L (LF) engine
2010 Mazda5 with 2.3L (L3) engine

 

DESCRIPTION

Some vehicles may experience the MIL on with DTC P2096:00 (Target A/F feedback system too lean). This is caused by improper control logic of the PCM. To repair the problem, the PCM reprogramming files have been updated with improved software.

Customers having this concern should have their vehicle repaired using the following repair procedure

 

 

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