What it means
Turbocharger outlet pressure sensor A reading is outside the expected range or does not behave as expected.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Turbocharger outlet pressure sensor A measures pressure after the compressor so the control module can assess boost conditions. This code means the sensor's reading is outside the expected range or does not change as expected; sensor drift, aging, or loose mounting can make the reported pressure unreliable.
Common causes
Most likely first.
- Sensor reading drifted
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
Symptoms
- Check engine light on
How to diagnose it
- Record freeze-frame data and compare sensor A's outlet-pressure reading with other pressure data under the same operating conditions.
- With the engine off, check whether the reading is plausible against atmospheric pressure and the vehicle's other pressure sensors.
- Inspect sensor A's mounting for looseness and check its pressure opening for blockage or contamination.
- Inspect the connector and harness for corrosion, damaged insulation, poor pin contact, or a wiring fault that could distort the signal.
- If the mounting, pressure path, and wiring are sound, test sensor A's response across operating conditions against the manufacturer's specification.
Common fixes
- Secure loose mounting for turbocharger outlet pressure sensor A.
- Clean a restricted sensor pressure opening using the manufacturer's service guidance.
- Repair poor connector contact or damaged wiring.
- Replace sensor A if its pressure reading drifts or fails the specified response test.
Can I keep driving?
The check-engine light may be the only obvious symptom, but an inaccurate outlet-pressure reading can interfere with boost control. Avoid heavy acceleration if power or boost behavior is abnormal and have the sensor checked 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.