What causes a P0129 code?

Common causes: Failed sensor; Clogged reference.

What are the symptoms of a P0129 code?

Typical symptoms: CEL; Poor performance at altitude.

Yes — this code is generally safe to drive with, but address it soon to avoid escalation. Estimated repair: $80-$250.

OBD-II Code · Sensors

Barometric Pressure Too Low

low severitySafe to drive$80-$250

Baro sensor reading abnormally low.

Common symptoms

Likely causes

Where to start

Try the cheapest cause first. Start by checking: failed sensor.
Cost & scope. $80-$250
If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.

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