What it means
The wastegate position sensor A signal does not correlate with the commanded actuator position within tolerance. Sensor offset, mechanical wear, or signal integrity degraded.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
- The engine or gearbox may go into limp mode
How it works
Wastegate position sensor A reports the position of the wastegate actuator, which regulates exhaust flow through the turbocharger. This code sets when sensor A's reported position does not track the commanded position closely enough, suggesting a sensor alignment, linkage, or signal problem.
Common causes
Most likely first.
- Sensor mechanically offset from actuator
- Linkage between sensor and wastegate worn
Symptoms
- Check-engine light
- Reduced engine power
- Weak acceleration or slower turbo response
How to diagnose it
- Record freeze-frame data and compare commanded wastegate position with sensor A's live position to see when and how they diverge.
- Inspect sensor A's connector and wiring for loose pins, corrosion, heat damage, or chafing near the turbocharger.
- With the engine off and following safe access procedures, inspect the wastegate linkage for looseness, wear, binding, or a sensor that has shifted on its mounting.
- Check sensor A's reference, ground, and signal circuits while moving the actuator through its operating range, comparing readings with the manufacturer's specification.
- If the circuit is sound, test sensor A and the actuator/linkage for smooth, repeatable response before replacing parts.
Common fixes
- Secure a loose sensor A connector or repair damaged wiring.
- Correct sensor A alignment if it has shifted and the manufacturer's procedure permits adjustment.
- Repair worn or loose wastegate linkage that prevents sensor position from following actuator movement.
- Replace sensor A if its signal remains inaccurate with correct alignment and sound wiring.
Can I keep driving?
Reduced power and slow turbo response can make overtaking and merging difficult; avoid hard acceleration and heavy loads. Continued operation with poor boost control can worsen drivability, so arrange diagnosis soon.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.