P1129 - Downstream Oxygen Sensors Swapped from Bank to Bank

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

P1129 Possible Causes

  • Faulty Manifold Absolute Pressure Sensor
  • Manifold Absolute Pressure Sensor harness is open or shorted
  • Manifold Absolute Pressure Sensor circuit poor electrical connection

How do I fix code P1129

    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 code

    Labor: 1.0

    The cost of diagnosing the P1129 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.

P1129 Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine hard to start
  • Rough or erratic idle speed

P1129 Meaning

The Manifold Αbsolute Pressure (MΑP) sensor generates a signal that is proportional to the amount of vacuum in the intake manifold. The signal is sent to the Engine Control Mudule (ECM) and the information is used to control the air/fuel mixture ratio. Faulty MΑP sensor can cuase the engine to stall, surge or a rough idle.
OBDII Code P1129 - Downstream Oxygen Sensors Swapped from Bank to Bank  - Engine-Codes.com

P1129 More Information

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