PowertrainP03B8
SeriousSeverity: Serious - have it checked soon
Cylinder 4 pressure too low
Key terms: Catalytic converter: cleans the exhaust gases · Powertrain: engine, transmission and emissions
1What it means in plain English
This range covers ignition and engine-speed signals, including misfires and crankshaft or camshaft position sensors.
2Common causes
- Worn or fouled spark plug
- Faulty ignition coil
- Vacuum or intake air leak
- Low fuel pressure
- Faulty crankshaft or camshaft position sensor
- Low engine compression
3Can I drive?
A failing crankshaft or camshaft sensor can cut the engine without warning, and a flashing check-engine light points to a misfire that can damage the catalytic converter. If the light is flashing, stop as soon as it is safe and have the car towed. Otherwise drive gently to a workshop; if it stalls or will not restart, have it towed.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 12
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P03B8 | No description available | Powertrain |
| Daewoo | P03B8 | No description available | Powertrain |
| EOBD | P03B8 | Cilinder 4 druk te laag Brand | Powertrain |
| GM | P03B8 | No description available | Powertrain |
| Holden | P03B8 | Cylinder 4 Low Pressure Brand | Powertrain |
| Honda | P03B8 | No description available | Powertrain |
| Isuzu | P03B8 | No description available | Powertrain |
| Land Rover | P03B8 | Cylinder 4 Pressure Too Low Brand | Powertrain |
| Opel | P03B8 | No description available | Powertrain |
| Peugeot | P03B8 | No description available | Powertrain |
| Saab | P03B8 | No description available | Powertrain |
| Toyota | P03B8 | Cylinder 4 pressure too low Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Related codes
Browse Pxxx codes or P03Bxx codes.