Emission Control System Pressure Sensor Fault
Indicates a malfunction in the emission control pressure sensor.
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What it means (plain English)
The emission control pressure sensor is reading either too high or too low, which can cause issues with emissions and performance.
What the computer is actually seeing
The ECU is receiving a voltage outside the normal range (typically 0.5 to 4.5 volts) from the emission control pressure sensor, likely indicating a fault.
What a healthy reading looks like
Normal voltage from the pressure sensor should be between 0.5 to 4.5 volts depending on engine load and conditions.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring and connectors to the emission control pressure sensor for damage or corrosion. Any issues found here should be repaired first.
- 22. Measure the voltage at the pressure sensor connector while the engine is running. It should be between 0.5 to 4.5 volts. If not, proceed to step 3.
- 33. Disconnect the sensor and check if the voltage returns to normal at the ECU. If it does, the sensor is likely faulty and needs replacing. If not, proceed to step 4.
- 44. Inspect the engine for exhaust leaks that could affect pressure readings. Fix any leaks found and retest the sensor.
- 55. If the sensor and wiring are okay, and no leaks are present, consider checking the ECU for faults.
Common causes
- Faulty emission control pressure sensor
- Wiring issues or poor connections to the sensor
- Exhaust leaks causing incorrect pressure readings
- Faulty ECU receiving incorrect sensor data
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to address this code soon as it can affect emissions and vehicle performance.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code will likely return.
Why does this code sometimes appear with low power issues?
The faulty sensor can affect the fuel-air mixture, leading to reduced engine power.
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