Powertrain, generic (extended)

P2217 NOx Sensor Circuit Intermittent (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2217 describes a bank 2 NOx sensor whose measuring path fails only now and then: the reading drops out or the sensor briefly reports an electrical error, then recovers. A smart NOx sensor evaluates its own probe lines and sends status flags for open or shorted circuits alongside the value over CAN; flags that toggle point to this code rather than to the steady fault P2213. No manufacturer documents P2217, nor its bank 1 twin P2204, with thresholds, so the debounce logic is calibration-specific; CARB generally requires continuous detection of NOx sensor continuity faults. Typical causes are a loose terminal, a lead that cracks when hot, or water entering the connector. The warning lamp may come and go.

Likely causes

Loose or corroded terminals at the bank 2 sensor connector
Lead near the exhaust cracked by heat or vibration
Sporadic fault in the sensor module electronics

Symptoms

  • Malfunction indicator lamp that comes and goes
  • Bank 2 NOx value briefly invalid in live data

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

nox sensornox sensor wiring

Related codes

P2204P2213P2215P2216P2225

References: law.cornell.edu, ni.com, hella.com.