P0398
Cylinder pressure sensor, cylinder 1 circuit high
Generic code
Ignition System
High severity
Hard repair
Free on OBD DashX
Want real-world data on P0398?
See which problems come with P0398, how often it shows up in other vehicles, and how to fix it — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
What P0398 means
- The fault code P0398 indicates that there is an issue with Cylinder 1 pressure sensor.
Possible symptoms
- Illuminated check engine light
- Rough idle or stalling
- Reduced engine power or acceleration
- Difficulty starting the engine
Possible causes
- Failed cylinder 1 pressure sensor
- Faulty wiring or connections in the circuit
- Failed engine control module (ECM) (less likely).
Related parts
- Cylinder Pressure Sensor: Cylinder pressure Sensor monitors the pressure inside the engine cylinder during engine operation (like air intake, combustion, exhaust). Problems lead to engine misfire
Possible solutions
- Replace the cylinder 1 pressure sensor
- Check and repair any damaged wiring or connections
- Replace the engine control module (ECM) if necessary
Free on OBD DashX
P0398 on OBD DashX
Real-world causes, how often this code shows up, and the fix — step by step.
Open P0398 No sign-up needed · available in 10 languagesScan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.