DTC P0134, P0154 (19-21 9-Speed A/T)
DTC P0134 : Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Heater System Malfunction
DTC P0154 : Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater System Malfunction
NOTE:
- Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems
- If DTC P2251 and/or P2254 * is stored at the same time as DTC P0134 and/or P0154 *, troubleshoot DTC P2251 and/or P2254 * first, then recheck for P0134 and/or P0154 *.
- Information marked with an asterisk (*) applies to the front bank (Bank 2).
| DTC Description | Confirmed DTC | Pending DTC |
|---|---|---|
| P0134 Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Heater System Malfunction | ||
| P0154 Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater System Malfunction |
DTC (PGM-FI)
- Problem verification
-1. Turn the vehicle to the ON mode.
- 2. Clear the DTC with the HDS.
- 3. Turn the vehicle to the OFF (LOCK) mode.
- 4. Start the engine, and let it idle without load (in P or N) for at least 1 minute.
- 5. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC P0134 Rear Air Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Heater System Malfunction P0154 Front Air Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater System Malfunction Is DTC P0134 and/or P0154* indicated?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the relay circuit board (PGM-FI subrelay circuit), and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems
- Open wire check (VSB1 (VSB2) * line):
- 1.Turn the vehicle to the OFF (LOCK) mode.
- 2. Jump the SCS line with the HDS, and wait more than 1 minute.
- 3. Disconnect the following connectors.
A/F sensor (Sensor 1) 6P connector PCM connector E (80P) - 4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode
PCM connector E (80P): disconnected A/F sensor (Sensor 1) 6P connector: disconnected Test point 1 Rear A/F sensor (Bank 1, Sensor 1) 6P connector (female terminals) No. 6: Front A/F sensor (Bank 2, Sensor 1) 6P connector (female terminals) No. 6*: Test point 2 PCM connector E (80P) No. 45 - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or
PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2019 2020), or
PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)PCM connector E (80P) No. 42 - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018), or
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or
PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2019 2020) *Is there continuity?
YES
The VSB1 (VSB2) * wire is OK. Go to step 3.
NO
Repair an open in the VSB1 (VSB2) * wire between the PCM (E45 (E42) *) and the A/F sensor (Sensor 1).
- PCM output voltage check
-1. Reconnect the following connector.
PCM connector E (80P) - 2. Exit the SCS mode with the HDS.
- 3. Start the engine, and let it idle without load (in P or N) for at least 1 minute.
- 4. Measure the voltage between test point 1 and 2.
Test condition Engine running A/F sensor (Sensor 1) 6P connector: disconnected Test point 1 Rear A/F sensor (Bank 1, Sensor 1) 6P connector (female terminals) No. 6: Front A/F sensor (Bank 2, Sensor 1) 6P connector (female terminals) No. 6*: Test point 2 Body ground Is there about 0.2 V or less?
YES
Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM - Refer to: PCM Removal and Installation (6-Speed A/T), (9-Speed A/T 2016 2017 2018), or PCM Removal and Installation (9-Speed A/T 2019 2020 2021) , then recheck. If DTC P0134 and/or P0154* goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (9-Speed A/T 2019 2020 2021), or PCM Removal and Installation (6-Speed A/T), (9-Speed A/T 2016 2017 2018) .
NO