P0137 on Mercedes-Benz: Symptoms, Causes & Fix
Official technical diagnostic wire for fault code P0137 specifically affecting Mercedes-Benz vehicles (C-Class, E-Class, S-Class, GLC, GLE).
Select Your Mercedes-Benz Model for P0137:
1. Common Symptoms on Mercedes-Benz Vehicles
When Mercedes-Benz Engine Control Modules (ECM) trigger fault code P0137, drivers typically report:
2. Root Causes on Mercedes-Benz Engines
Historical diagnostic claims across Mercedes-Benz engines point to the following failure distribution:
3. Step-by-Step Fix Protocol for Mercedes-Benz
Listen for exhaust ticking or black soot around flex pipe, flanges, and sensor bungs before the catalytic converter. on Mercedes-Benz engines.
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 Mercedes-Benz engines.
Unplug harness, remove old sensor with 7/8 socket, install replacement sensor and plug firmly. on Mercedes-Benz engines.
Clear DTCs and verify B1S2 holds steady between 0.45V and 0.75V during steady highway cruising. on Mercedes-Benz engines.
Equipment for Diagnosing Mercedes-Benz (P0137)
Mercedes-Benz OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Mercedes-Benz.
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.
4. Mercedes-Benz P0137 Frequently Asked Questions
What does code P0137 mean on a Mercedes-Benz?
On Mercedes-Benz vehicles, P0137 indicates that the Engine Control Module (ECM) detected o2 sensor circuit low voltage (bank 1 sensor 2). This typically points to Exhaust leak upstream of or directly at the Sensor 2 bung letting in fresh air or Faulty downstream oxygen sensor.
Can I continue driving my Mercedes-Benz with code P0137?
Yes. Vehicle is fully drivable, but Check Engine Light will remain illuminated. Because this code carries a Low severity rating on Mercedes-Benz powertrains, we recommend scanning live data values promptly to prevent secondary damage.
How much does it cost to fix code P0137 on a Mercedes-Benz?
Estimated DIY parts cost ranges from $100 - $300 (DIY: $35 - $100), while professional shop repairs at an authorized Mercedes-Benz dealership or independent specialist typically range from $180 to $380 including diagnostic labor.