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P0159 Mercedes-Benz Code - O2 Sensor Circuit Slow Response Bank 2 Sensor 2

- Code Popularity: 5,653 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0159 Mercedes-Benz?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Rear Heated Oxygen Sensor Bank 2
  • Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
  • Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
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How to Fix the DTC P0159 Mercedes-Benz?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

Mercedes Benz Code = 0521 (Left O2 sensor, after TWC): Aging (P0159)

Replacing the O2 Sensor 2 usually takes care of the problem

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0159 Mercedes-Benz code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

The P0159 code is set when the Engine Control Module (ECM) detects that the rear O2 sensor takes more time to respond between rich and lean than the specified time.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive Smoke from Exhaust

Code P0159 Mercedes-Benz Description

This fault code is stored in the engine control module when the oxygen sensor response time is not as expected. This condition occurs if the sensor has been contaminated or is suffering from ageing. The ECM expects a voltage shift within a specific time frame under transient conditions. The rise and fall time of the sensor is monitored for this.

OBDII Code P0159 Mercedes-Benz - O2 Sensor Circuit Slow Response Bank 2 Sensor 2 - AutoCodes.com
P0159 Mercedes-Benz Code - O2 Sensor Circuit Slow Response Bank 2 Sensor 2

Need More Information on the Code?

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