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Home / DTC / P2209 — NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1

P2209 — NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1

Detailed page for trouble code P2209.

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Code

P2209

Generic P — Powertrain

NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 1

Brand: Generic
Type: P — Powertrain
Views: UK: 14 EN: 25 RU: 17
AI status
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Page language: EN

Causes

  • Open or short in NOx sensor heater element or its wiring
  • Poor or corroded connector or pin at sensor connector
  • Blown fuse or faulty heater relay (if used)
  • High resistance in wiring or grounds (intermittent connection)
  • Failed NOx sensor (heater element or internal electronics)
  • PCM/ECM driver fault or internal short

Symptoms

  • MIL (Check Engine) illuminated
  • Reduced emission system performance or regens inhibited (diesel/SCR systems)
  • Possible limp or reduced-power mode on some vehicles
  • Failed emissions test or NOx-related readiness monitors not setting
  • DTC may return intermittently or be permanent

What to check

  • Confirm freeze frame and freeze/active data for P2209 with a scan tool
  • Visual inspection of sensor, connector, and wiring for damage, corrosion, heat exposure
  • Check relevant fuses and heater relay (if applicable)
  • Backprobe connector and monitor heater supply voltage and heater sense signal while commanding heater ON/OFF
  • Measure heater element resistance at the sensor (with connector disconnected)
  • Check continuity and for short to power/ground between sensor connector pins and PCM

Signal parameters

  • Heater supply voltage: typically battery voltage (~12–14V) when commanded ON
  • Heater current draw: commonly in the range of ~0.5–5 A (varies by sensor)
  • Heater element resistance: typical approximate range 2–20 ohms (manufacturer-specific)
  • Heater control: PCM switches supply or ground; monitor for expected on/off commands in data stream

Diagnostic algorithm

  1. Read and record freeze frame and all NOx/heater-related codes. Note vehicle symptoms and operating conditions when code set.
  2. Perform a visual inspection of the NOx sensor (Bank 1 Sensor 1), connector, wiring harness, and nearby exhaust for heat damage or physical stress.
  3. Check fuses and relays related to heater supply. Replace if blown/failed.
  4. With key ON and engine OFF, backprobe the sensor connector: verify presence of heater supply (when commanded) and ground paths per vehicle service manual.
  5. Command the heater ON with a scan tool (if supported) and measure heater supply voltage and current. Verify PCM is commanding the heater and that supply responds.
  6. Disconnect sensor and measure heater element resistance with an ohmmeter. Compare to manufacturer spec or typical range. Very high/OL = open; very low = short.
  7. Check continuity from the sensor heater pins to the PCM connector and check for short to battery or ground with harness disconnected. Repair any wiring faults found.
  8. If wiring and supply are good, install a known-good sensor or replace the NOx sensor. Re-clear codes and verify proper operation on road/test cycle.
  9. If faults persist with a known-good sensor, inspect PCM outputs and consider module diagnosis/repair per manufacturer procedure.
  10. Safety note: exhaust and sensor will be very hot—allow to cool or protect hands when accessing the sensor. Disconnect battery when replacing sensor if required by procedure.

Likely causes

  • Damaged or corroded sensor connector / wiring harness
  • Failed NOx sensor heater element
  • Blown fuse or failed heater relay
  • Short to battery or ground in heater circuit
  • PCM heater driver fault (less common)

Fault status

⚠️ Status
NOx sensor heater sense circuit range/performance fault detected for Bank 1 Sensor 1 — heater circuit reading outside expected range (open, short, high resistance or poor connection).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P2200 P2201 P2202 P2203 P2204 P2205
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