OBD Guide
ENFRDEESPT

P129C

Ambient Pressure Sensor Run On Pressure Implausible

P129C is an OBD-II diagnostic trouble code meaning: Ambient Pressure Sensor Run On Pressure Implausible. Common causes: atmospheric pressure sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Unstable engine idling
  • Reduced engine power
  • Increased fuel consumption
  • Check Engine Light Illuminates
  • Problems starting the engine

Causes

  • Atmospheric pressure sensor malfunction
  • Open or short circuit in the sensor circuit
  • Poor contact in the sensor connector
  • Sensor contamination
  • ECU problems (rare)

How to Fix

  1. Check the continuity of the atmospheric pressure sensor circuit
  2. Clean sensor connector contacts
  3. Check the functionality of the sensor using diagnostic equipment
  4. Replace the atmospheric pressure sensor if necessary
  5. Update ECU firmware (if required)

Related codes

P129BP129DP0107

FAQ

What does the P129C code mean?

P129C is an OBD-II diagnostic trouble code that indicates: Ambient Pressure Sensor Run On Pressure Implausible

What causes a P129C error code?

The most common causes of P129C include: Atmospheric pressure sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Sensor contamination.

How do I fix a P129C diagnostic trouble code?

To fix P129C: Check the continuity of the atmospheric pressure sensor circuit. Clean sensor connector contacts. Check the functionality of the sensor using diagnostic equipment. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P129C?

Yes, but get it checked soon

How much does it cost to fix P129C?

The estimated repair cost for P129C is $17–56. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat