P03B7
Cylinder 4 Pressure Sensor Circuit Intermittent/Erratic
Generic OBD-II
Common symptoms
What you'll notice
- Check and replace spark plug in cylinder 4
- Inspect and replace ignition coil in cylinder 4
- Clean or replace fuel injector in cylinder 4
- Check and clean the electrical connections in the cylinder 4 pressure sensor circuit
Common causes
Most likely first
- Faulty cylinder 4 pressure sensor
- Loose or damaged wiring or connectors in the cylinder 4 pressure sensor circuit
- Engine misfire in cylinder 4
- Faulty engine control module (ECM)
- Low fuel pressure in cylinder 4
How to diagnose & fix
Work through it in order
- Engine misfires or runs rough
- Loss of power or acceleration
- Rough idle or stalling
- Poor fuel efficiency
- Check Engine Light (MIL) illuminated
Read & clear P03B7 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.