Engine-Codes - Ford - P1129 2003 Ford F150

P1129 2003 Ford F150 Code - Downstream Oxygen Sensors Swapped from Bank to Bank

- Code Popularity: 2,006 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1129 2003 Ford F150?

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 2003 Ford F150?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1129 2003 Ford F150 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

What Does the P1129 2003 Ford F150 Code Mean?

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.

P1129 2003 Ford F150 Code - Downstream Oxygen Sensors Swapped from Bank to Bank

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