Engine Error
P0129
Barometric Pressure Too Low
Severity
Medium
Symptoms
Lack of power, rich exhaust smell, stalling at high altitudes
Common Causes
- Failed Barometric Pressure (BARO) sensor
- Severe vacuum leak
- Restricted exhaust/clogged catalytic converter
- Incorrect sensor wiring voltage
How to Fix
- 1 Replace BARO or MAP sensor (often combined)
- 2 Smoke test the intake for leaks
- 3 Perform an exhaust backpressure test
- 4 Test 5V reference circuit
Estimated Repair Cost
USD
$80
–
$1000
BARO sensor: 100 - 250; Catalytic converter (if clogged): 800+