NOx Sensor Heater Control Circuit Range/Performance Bank 1 Sensor 2

Where it lives

For P220F, the part to look at first is the sensor named here. The description of P220F puts it on bank 1.

Check these first

• A NOx sensor heater element that has weakened
• Intermittent wiring to the bank 1 sensor 2 heater
• Water in the sensor connector corroding the heater pins
• A low or unstable supply voltage to the heater

What to do next

1. Measure the heater element resistance against a known-good value
2. Inspect the heater wiring for opens, rubs and heat damage
3. Check the connector for water and green corrosion
4. Verify the heater supply voltage with the key on
5. Replace the NOx sensor if the heater is out of range
6. Clear the code and retest

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