Cylinder Pressure Sensor Circuit (Bank 1)
The P0395 code means the vehicle's onboard diagnostic system has detected: Cylinder Pressure Sensor Circuit (Bank 1). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $800 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Rough engine operation
- Possible knock or detonation
- Reduced performance
Probable Causes (Ranked by Likelihood)
- Faulty cylinder pressure sensor Very High
- Damaged sensor wiring High
- Sensor connector corrosion Moderate
- PCM input circuit fault Low
Step-by-Step Diagnostic Procedure
-
Read cylinder pressure sensor data on scan tool.
-
Inspect sensor connector for damage or corrosion.
-
Measure sensor output voltage (varies by type).
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Check wiring continuity from sensor to PCM.
Frequently Asked Questions
What is a cylinder pressure sensor?
Some modern engines use in-cylinder pressure sensors to directly measure combustion pressure. This enables precise ignition and fuel control.
Is a cylinder pressure sensor the same as a knock sensor?
No, a cylinder pressure sensor measures actual combustion pressure, while a knock sensor detects vibration from detonation. Some systems use pressure sensors instead of knock sensors.
Are cylinder pressure sensors common?
They are becoming more common on European engines and some diesel engines but are not yet standard on all vehicles.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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