P2213

Code

Generic P — Powertrain

NOx Sensor Circuit Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 27 EN: 35 RU: 22

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Causes

Open or shorted wiring/connectors to the NOx sensor (bank 2)
Failed NOx sensor (internal electronics or sensing element)
NOx sensor heater failure or open circuit
Corroded/loose connector or poor ground
Blown fuse or loss of reference/power to sensor circuit
Exhaust contamination (oil, coolant, soot) causing sensor failure

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Possible failed emissions test or increased NOx emissions
Engine management may enter limp or emissions-protection mode on some vehicles
Reduced effectiveness of NOx control strategies (exhaust aftertreatment warnings)
Possible diagnostic trouble codes for related sensors or heater circuits

What to check

Connect a scan tool and record freeze-frame and live data for bank 2 NOx sensor and heater status
Compare bank 2 NOx readings to bank 1 while engine is at operating temperature
Inspect sensor connector and wiring for heat damage, chafing, corrosion or disconnection
Check related fuses and power/ground circuits at the ECU and sensor
Measure heater resistance at the sensor connector with engine off
Back-probe signal wire and monitor voltage while engine running (observe response to load/idle changes)

Signal parameters

NOx sensor signal: typically 0–5.0 V digital/analog range depending on sensor type (verify manufacturer spec)
Heater circuit resistance: typically a low resistance value (single to low double-digit ohms) — consult OEM spec
Supply voltage for sensor heater: typically battery voltage when enabled (~12 V)
Expected signal behavior: sensor voltage/reading should change with load and exhaust composition; heater should draw current until up to operating temp
Response time: sensor should show a change in output within seconds of a fuel/air change (varies by sensor type)

Diagnostic algorithm

Read and record DTCs, freeze frame and live data with a scan tool. Note related codes (heater, power, ground).
Visually inspect the NOx sensor (bank 2) connector and wiring harness for heat damage, corrosion, pin push-out, or chafing. Repair any damage.
Verify power and ground at the sensor connector with key on. Check related fuses and wiring to the ECU.
With engine off, measure heater circuit resistance at the sensor connector and compare to OEM spec. If open/high resistance, suspect heater or wiring.
With engine running and safe to do so, back-probe signal wire and record voltage/NOx reading. Wiggle harness to check for intermittent faults.
Compare bank 2 sensor data to bank 1 under similar conditions. If bank 2 is incorrect while bank 1 is normal, focus on sensor and wiring for bank 2.
If wiring and power/ground are good but sensor signal is out of range or does not respond, replace the NOx sensor (bank 2).
After repair, clear codes and perform a drive cycle or manufacturer-recommended relearn/initialization. Re-scan to confirm the code does not return.
If problem persists after replacing sensor and repairing wiring, consider ECU-related diagnostics or consult manufacturer-specific procedures.

Likely causes

Damaged harness at exhaust flex or mounting point
Failed NOx sensor (most common)
Connector corrosion or pin damage at sensor or ECU
Heater circuit open or excessive resistance
Blown sensor fuse or failed power/ground circuit

Fault status

⚠️ Status

P2213 — NOx Sensor Circuit Bank 2: ECM detected an abnormal/no response or fault in the NOx sensor circuit for bank 2 (open/short/invalid signal or heater fault).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours