P01FE
Turbocharger Outlet Pressure Sensor B Intermittent/Erratic.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 1
- AreaFuel and air metering
- FE
- FaultThe specific fault in that area
What it means
P01FE is a generic code meaning the control unit has seen an intermittent or erratic signal from turbocharger outlet pressure sensor B. The reading drops out, spikes or jumps in a way that does not match engine load, other pressure sensors or the commanded boost. Which sensor is 'B' and where it sits depends on the model and engine layout.
Symptoms
- Engine warning light on
- Intermittent loss of power or limp mode
- Surging or uneven boost delivery
- Hesitation or jerky acceleration under load
- Possible black smoke or poor fuel economy
- Occasional turbo or boost-related fault messages that come and go
Possible causes
- Damaged, chafed or corroded wiring to the pressure sensorlikely
- Loose, dirty or corroded sensor connector pinslikely
- Failing turbocharger outlet pressure sensorlikely
- Blocked, split or loose sensor pipe or port (where fitted), or boost leak near the sensorpossible
- Sensor reference voltage or ground faultpossible
- Oil or soot contamination of the sensor portpossible
- Fault in the control unitrare
How to diagnose
- Read all stored and pending codes and note any other boost, MAF or pressure sensor faults
- Review freeze frame data to see engine speed, load and boost at the time the code set
- Visually inspect the sensor, its connector and the wiring for chafing, heat damage, water ingress and corrosion
- Wiggle test the harness and connector with live data showing sensor B, watching for dropouts or spikes
- Compare sensor B reading with other pressure sensors and with barometric pressure at key on, engine off
- Check the sensor port, hose or pipe for blockage, oil, soot, splits or loose clamps, and smoke test the intake for boost leaks
- Check reference voltage, ground and signal wiring continuity against the manufacturer wiring diagram
- Check for a relevant software update or technical bulletin for the specific model and engine
How to fix
- Repair or replace damaged wiring and fix any terminal problems
- Clean or replace corroded connector terminals or the connector
- Replace the pressure sensor if its signal is erratic and the wiring checks out
- Clear or replace blocked or damaged sensor pipes and seals, and repair any boost leaks
- Update the control unit calibration only if an outdated one is a known cause for that model
Can I keep driving?
Medium severity
The car can usually be driven carefully for a short time, but it may drop into limp mode without warning, which can be unsafe when overtaking. Get it checked soon, as running with unreliable boost control can lead to further faults.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.