P00D4

Symptoms

• Check Engine light on dashboard
• Slow warming up of the oxygen sensor after starting the engine
• Possible increased fuel consumption
• Increased emissions of harmful substances
• Scanner shows slow response of bank 2 sensor 2 on cold engine

Causes

• Partial failure of the sensor heating element (increased resistance)
• Weak contact in the heater circuit (oxidation of the connector)
• Low voltage in the on-board network, insufficient for normal operation of the heater
• Exhaust gases or moisture entering the sensor connector
• Sensor aging (oxygen sensor service life 60,000–100,000 km)

How to Fix

1. Read codes and compare with other oxygen sensor codes
2. Check the voltage of the on-board network - it should be 13.5–14.5V with the engine running
3. Measure the resistance of the heater of sensor 2 of bank 2 (standard 2–20 Ohms); increased value = heater degradation
4. Check the sensor connector and wiring for oxidation and damage.
5. Connect the scanner and observe the warm-up time of the sensor after a cold start
6. If the heater is outside the norm or the sensor is old (>100,000 km), replace the oxygen sensor

Related codes

Error P00D4 by Vehicle Brand