P2218NOx Sensor Heater Control Circuit/Open (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- A NOx sensor cannot measure until its built-in heater has taken the ceramic cell to several hundred degrees, and the sensor electronics switches that heater itself. P2218 reports a break in the heater control path of the bank 2 sensor, either inside the probe or in the lead to the sensor module. No manufacturer documents the bank 2 version. The bank 1 code P2205 is well described: GM's 6.6L LML sets it when an open heater is reported longer than 10 s with the battery at 11 V or more, the 3.0L LZ0 on an open load at the heater control pin, both Type A with the MIL after one trip. Without heating, the bank 2 sensor never becomes ready. P2219 and P2220 are the shorted cases, P2221 the heater sense side.
- What you may notice
- Malfunction indicator lamp on after one trip
- Bank 2 NOx sensor never reports ready
- Likely causes
- LikelyHeater element in the bank 2 NOx probe burnt through
- PossibleBroken conductor between probe and sensor module
- RarePushed-back or corroded pin in the sensor connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €150 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.