P2243 - O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor

[QuatA4]

Guys,

Just got my Bluetooth OBDII sensor and the check engine light is due to this error according to Carista:

OBD2 - confirmed:
P2243 - O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1
P0130 - O2 Sensor Circuit Bank 1 Sensor 1

OBD2 - pending:
P2243 - O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1
P0130 - O2 Sensor Circuit Bank 1 Sensor 1

Does this 100% mean its the o2 sensor?

What does the pending vs confirmed mean?

[QuatA4]

Nobody has seen these codes before?

[van462]

P0130 is usually a pretty sure sign of a bad O2 sensor. I know that using the torque app I can read the voltage output from the rear O2 I'll try and check tomorrow if it reads voltage from the front O2 sensor. I know torque app gives an air fuel ratio and that data should be coming from the front O2. I haven't seen the Pending and confirmed before. It might be due to it being an O2 sensor and it has a confirmed set fault code (CEL light) and a pending as the emissions readiness system likely keeps running test.
I also think that its a heated O2 sensor so it can fail in 2 ways, the car should check resistance of the heater portion and then have a voltage output from the O2 portion. I would open the hood and make sure the sensor is tight and the wiring coming from it to the harness plug are in good shape. I would unplug and replug it in as well.

Edit. I logged into torque this AM and there is a reading for the Bank 1 Sensor 1 Catalysts heating. I forgot to look for a lambda reading from the sensor.

[QuatA4]

Is there a how to or pic on how to get to the 02 sensor to plug and unplug?

[van462]

The plug is easy to get to. The O2 sensor is on the catalytic converter just aft of the turbo. Follow the harness up about 15 inches. It should clipped to the heat shield.

[Jerry1847]

The plug is easy to get to. The O2 sensor is on the catalytic converter just aft of the turbo. Follow the harness up about 15 inches. It should clipped to the heat shield.

You are going to want to get a proper tool to remove the O2 sensor. Otherwise it will really suck for you. Also, amazon will have some cheaper bosch sensors. Had to replace on a few months ago.

[van462]

I was able to log some data on the trip home today that maybe you can use for a reference or for others in the future. In torque under realtime displays select graph nad pick "O2 sensor 1 equivalence ratio". The O2 sensor compares the oxygen content from the exhaust and compares it atmosphere O2 levels the differences. This is referred to as Lambda torque calls it equivalence. The ECU is trying to achieve a value of 1. At idle it will be practically a smooth line with very little variance. Driving around it does stay around 1 but with some variance as the ECU is varying fuel slightly. The ECU is creating a slightly lean to rich mixture (visible as a small ripple on the graph) to verify its running correctly. When I let off throttle and the engine is "braking" I see a spike to 2 and it will hold at 2 while the engine is braking.
So with Torque app you can see the air fuel ratio, the catalyst heating, and equivalence ratios. Looking for values in these blocks you can determine if the sensor is working. If the system can't maintain a equivalence ratio of 1 at idle I would look for an air leak at the turbo to cat flange or make sure the O2 sensor is secure.