Engine-Codes - Ford - P1129 FORD

P1129 FORD - Downstream Oxygen Sensors Swapped from Bank to Bank

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?

P1129 FORD Possible Causes

    Crossed HO2S harness connectors (downstream) Crossed HO2S wiring at the harness connectors (downstream) Crossed HO2S wiring at the 104-pin harness connectors (downstream)

How do I fix code P1129 FORD

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's pins.

Cost of diagnosing the P1129 FORD code

Labor: 1.0

The cost of diagnosing the P1129 FORD code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

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

P1129 FORD Meaning

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 FORD More Information

Need more information on how to fix the P1129 FORD code?
Get Access to Factory Service Manuals

Need more help?

Get the P1129 Ford code diagnosed by a professional: Find a repair shop in your area