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P1129 Mercury Code - Downstream Oxygen Sensors Swapped from Bank to Bank

- Code Popularity: 1,494 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1129 Mercury?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
    Crossed HO2S harness connectors (downstream) Crossed HO2S wiring at the harness connectors (downstream) Crossed HO2S wiring at the 104-pin harness connectors (downstream)
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How to Fix the DTC P1129 Mercury?

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.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1129 Mercury 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.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P1129 Mercury Description

The heated oxygen sensor (HO2S) monitor determines if the HO2S signal response for a fuel shift corresponds to the correct engine bank. The test fails when a response from the HO2S being tested is not indicated.

OBDII Code P1129 Mercury - Downstream Oxygen Sensors Swapped from Bank to Bank  - AutoCodes.com
P1129 Mercury Code - Downstream Oxygen Sensors Swapped from Bank to Bank

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Code P1129 Mercury comments

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