OBD-II code · Powertrain (generic, extended)
P2438 AIR System Air Flow or Pressure Sensor Circuit High Bank 2
Same as P2433 on bank 2. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P2438?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–2 h
- Emissions test
- Likely to fail
- Parts involved
- Air System Flow Sensor B2
Related codes
- P2433AIR System Air Flow or Pressure Sensor Circuit High Bank 1
- P2435AIR System Air Flow or Pressure Sensor Circuit Bank 2
- P2436AIR System Air Flow or Pressure Sensor Circuit Range or Performance Bank 2
- P2437AIR System Air Flow or Pressure Sensor Circuit Low Bank 2
- P2439AIR System Air Flow or Pressure Sensor Circuit Intermittent or Erratic Bank 2
- P243AParticulate Filter Restriction Ash Accumulation Bank 2
- P243BParticulate Filter Restriction Forced Limited Power Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.