P0137 on Audi A4
Factory diagnostic protocol and troubleshooting wire for fault code P0137 specifically for the Audi A4 (2020–2026, 2.0L TFSI Turbo 4-Cyl (EA888 Gen 4 201HP–261HP)).
1. Symptoms of P0137 on Audi A4
When the Engine Control Module (ECM/PCM) on your Audi A4 (2.0L TFSI Turbo 4-Cyl (EA888 Gen 4 201HP–261HP)) logs fault code P0137, drivers commonly observe:
2. Most Likely Causes on Audi A4
Historical warranty claims and technical repair bulletins for Audi A4 point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Audi A4
Listen for exhaust ticking or black soot around flex pipe, flanges, and sensor bungs before the catalytic converter. on the Audi A4 equipped with 2.0L TFSI Turbo 4-Cyl (EA888 Gen 4 201HP–261HP).
Monitor B1S2 voltage. Snap the throttle to enrich mixture; voltage should briefly spike above 0.8V. If it remains 0.0V–0.1V, sensor is defective or shorted. on the Audi A4 equipped with 2.0L TFSI Turbo 4-Cyl (EA888 Gen 4 201HP–261HP).
Unplug harness, remove old sensor with 7/8 socket, install replacement sensor and plug firmly. on the Audi A4 equipped with 2.0L TFSI Turbo 4-Cyl (EA888 Gen 4 201HP–261HP).
Clear DTCs and verify B1S2 holds steady between 0.45V and 0.75V during steady highway cruising. on the Audi A4 equipped with 2.0L TFSI Turbo 4-Cyl (EA888 Gen 4 201HP–261HP).
Equipment for Diagnosing Audi A4 (P0137)
Audi A4 OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Audi A4.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
Other Common Fault Codes on Audi A4
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the Audi A4:
4. Audi A4 P0137 FAQs
What causes code P0137 to trigger on a Audi A4?
On the Audi A4 (2.0L TFSI Turbo 4-Cyl (EA888 Gen 4 201HP–261HP)), P0137 is most frequently caused by Exhaust leak upstream of or directly at the Sensor 2 bung letting in fresh air or Faulty downstream oxygen sensor.
Where is the OBD-II port located on my Audi A4?
On the Audi A4, the 16-pin DLC diagnostic connector is located Under driver side dashboard near hood release lever (pink/purple port). Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my Audi A4 with code P0137?
Yes. Vehicle is fully drivable, but Check Engine Light will remain illuminated. Given that P0137 carries a Low severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.