OBD-II Generic Error Code P0129: How to Fix It

Q: What does OBD-II code P0129 mean?

Code P0129 means the barometric pressure sensor is reading lower than expected. This can affect air-fuel mixture and engine performance.

Q: Can I drive with code P0129?

You may notice poor performance, but it is generally safe to drive short distances. However, address the issue promptly to prevent further problems.

Q: Is P0129 the same as a MAP sensor problem?

The BARO sensor is often integrated with the MAP sensor. A faulty MAP sensor can also trigger P0129.

Q: How much does it cost to fix P0129?

If the sensor needs replacement, parts cost $20-$100. DIY labor is free; shop labor may add $50-$150.

Q: Will clearing the code fix P0129?

Clearing the code may temporarily turn off the check engine light, but if the underlying issue isn't fixed, the code will return.

Abstract

OBD-II error code P0129 indicates that your vehicle's powertrain control module (PCM) has detected that the barometric pressure (BARO) sensor reading is lower than expected. This can cause poor engine performance, rough idling, or hard starting. The fix typically involves checking the BARO sensor wiring, cleaning the sensor, or replacing it.