OBD Guide
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P129B

Absolute Pressure Sensor Intake Pipe Overrun Pressure Implausible

P129B is an OBD-II diagnostic trouble code meaning: Absolute Pressure Sensor Intake Pipe Overrun Pressure Implausible. Common causes: map sensor malfunction, depressurization of the intake manifold. Estimated repair cost: $17–78.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–78 (est.)

Symptoms

  • Unstable engine operation when releasing gas
  • Deterioration in acceleration dynamics
  • Increased fuel consumption
  • Stalls when releasing gas suddenly
  • Check Engine Light Is On

Causes

  • MAP sensor malfunction
  • Depressurization of the intake manifold
  • MAP sensor contaminated with oil deposits
  • Problems with vacuum hoses
  • Open or short circuit in the sensor circuit

How to Fix

  1. Check the integrity of the vacuum hoses
  2. Clean or replace MAP sensor
  3. Check the intake manifold for leaks
  4. Check the electrical wiring and connectors of the sensor
  5. Test the sensor readings with a scanner

Related codes

P0106P0107P0108

FAQ

What does the P129B code mean?

P129B is an OBD-II diagnostic trouble code that indicates: Absolute Pressure Sensor Intake Pipe Overrun Pressure Implausible

What causes a P129B error code?

The most common causes of P129B include: MAP sensor malfunction; Depressurization of the intake manifold; MAP sensor contaminated with oil deposits; Problems with vacuum hoses.

How do I fix a P129B diagnostic trouble code?

To fix P129B: Check the integrity of the vacuum hoses. Clean or replace MAP sensor. Check the intake manifold for leaks. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P129B?

Limited driving only, diagnose soon

How much does it cost to fix P129B?

The estimated repair cost for P129B is $17–78. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat