P03D4

Symptoms

• Check Engine light on
• Inability to read cylinder 7 sensor data with scanner
• Unstable engine operation in certain modes
• Reduced efficiency of cylinder 7
• Increased fuel consumption

Causes

• Shorting the sensor signal wire to the power wire (12V or 5V)
• Internal sensor failure with short circuit to power supply
• Damage to the wiring insulation in the harness
• Incorrectly connected connector during a previous repair
• Moisture entering the connector with the formation of conductive channels

How to Fix

1. Disconnect the cylinder 7 pressure sensor connector
2. Measure the voltage at the signal contact of the harness connector - with normal wiring, about 5V
3. If the voltage is >5V, check the harness for short circuit with the power wire
4. If the voltage is ~5V, replace the pressure sensor
5. Check the connector for moisture and traces of short circuit.
6. Reassemble the circuit, reset codes and perform a diagnostic test

Related codes

Error P03D4 by Vehicle Brand