P03B5
Cylinder 4 Pressure Sensor Circuit Low
Generic OBD-II
Real-world scan data
Seen in
53
scans in the past year
Found in
<0.1%
of scans
<0.1%
of scans that found faults
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check and replace faulty cylinder 4 pressure sensor
- Inspect and repair any damaged or loose wiring connections related to the cylinder 4 pressure sensor
- Clean or replace dirty or clogged fuel injectors for cylinder 4
- Verify proper fuel pressure for cylinder 4 and address any fuel delivery issues if found
- Perform an engine compression test to identify any potential internal engine problems related to cylinder 4
Common causes
Most likely first
- Faulty cylinder 4 pressure sensor
- Loose or damaged wiring connections in the cylinder 4 pressure sensor circuit
- Low engine oil level in the cylinder 4
- Engine misfire in cylinder 4
- Faulty engine control module (ECM)
How to diagnose & fix
Work through it in order
- Decreased engine performance or power
- Misfires or rough idling when the engine is running
- Engine hesitation or stumbling during acceleration
- Reduced fuel efficiency or increased fuel consumption
- Illumination of the check engine light or OBD 2 error code related to cylinder 4 pressure sensor circuit low.
Read & clear P03B5 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.