P03B3
Cylinder 4 Pressure Sensor Circuit
P03B3 is an OBD-II diagnostic trouble code meaning: Cylinder 4 Pressure Sensor Circuit. Common causes: open or short circuit in the cylinder 4 pressure sensor circuit, faulty pressure sensor. Estimated repair cost: $33–133.
Symptoms
- Check Engine light on
- Reduced efficiency of cylinder 4
- Slight reduction in engine power
- Slight deterioration in fuel consumption
- Possible misfire
Causes
- Open or short circuit in the cylinder 4 pressure sensor circuit
- Faulty pressure sensor
- Damaged or oxidized sensor connector
- Damage to the sensor wiring harness
- ECU malfunction (extremely rare)
How to Fix
- Check pressure sensor circuit fuses
- Inspect the connector and wiring of the cylinder 4 pressure sensor
- Check the presence of power (usually 5V) at the sensor
- Check the sensor ground circuit
- Measure the sensor resistance and compare with the norm
- Replace the sensor if it is confirmed to be faulty
Related codes
Error P03B3 by Vehicle Brand
FAQ
What does the P03B3 code mean?
P03B3 is an OBD-II diagnostic trouble code that indicates: Cylinder 4 Pressure Sensor Circuit
What causes a P03B3 error code?
The most common causes of P03B3 include: Open or short circuit in the cylinder 4 pressure sensor circuit; Faulty pressure sensor; Damaged or oxidized sensor connector; Damage to the sensor wiring harness.
How do I fix a P03B3 diagnostic trouble code?
To fix P03B3: Check pressure sensor circuit fuses. Inspect the connector and wiring of the cylinder 4 pressure sensor. Check the presence of power (usually 5V) at the sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P03B3?
Do not drive — repair immediately
How much does it cost to fix P03B3?
The estimated repair cost for P03B3 is $33–133. Actual cost depends on your vehicle, location, and labor rates.
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