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Home / DTC / P043D — Catalyst Temperature Sensor Circuit High Bank 2 Sensor 2

P043D — Catalyst Temperature Sensor Circuit High Bank 2 Sensor 2

Detailed page for trouble code P043D.

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59brands
11,914generic
22,491specific
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Code

P043D

Generic P — Powertrain

Catalyst Temperature Sensor Circuit High Bank 2 Sensor 2

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Bank 2 Sensor 2 (post‑cat) temperature sensor (open/short or internal failure)
  • Wiring short to power or damaged insulation on sensor circuit
  • Corroded/loose connector or poor pin contact at sensor or ECM
  • Open or high resistance in signal, ground, or reference circuits
  • Excessive catalytic converter temperature (overheating/damage)
  • Faulty ECM or poor ECM connector/ground

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible reduced fuel economy or driveability issues if engine management adjusts
  • Exhaust smells (hot or burnt) or hotter-than-normal exhaust
  • Potential catalytic converter damage noise or rattling in severe cases
  • Stored freeze frame / sensor temperature / voltage data in scan tool

What to check

  • Retrieve freeze‑frame and live data with a capable scan tool; monitor Bank 2 Sensor 2 temperature/voltage while cold and after driving
  • Visually inspect sensor, connector and wiring harness for heat damage, corrosion, chafing or disconnection
  • Backprobe sensor connector and measure signal voltage with ignition on and engine running
  • Measure sensor resistance (if accessible) at ambient and when warmed per manufacturer spec
  • Check reference voltage and ground at the sensor connector for proper values and continuity
  • Wiggle harness while monitoring live data to look for intermittent faults

Signal parameters

  • Typical thermistor‑type post‑cat sensor produces a signal voltage that varies with temperature; expected operational range is generally within 0.2–4.8 V depending on temp and manufacturer
  • Resistance varies inversely with temperature for NTC sensors — expect a measurable change in ohms as sensor is heated/cooled (consult OEM spec)
  • Reference (sensor supply) voltage commonly ≈5.0 V or ignition/switched reference depending on system
  • Sensor ground should be near 0 V; poor ground will skew readings
  • Response time: sensor should show a steady, progressive change when exhaust temperature changes (no sudden jumps or fixed extreme readings)

Diagnostic algorithm

  1. Connect a scan tool and record freeze‑frame and live data for Bank 2 Sensor 2 (voltage and temperature). Note conditions when the code set.
  2. Perform a visual inspection: sensor, connector, wiring loom, heat shielding, and exhaust near sensor and cat.
  3. With ignition ON (engine OFF), backprobe the sensor connector: verify reference voltage and ground presence per vehicle spec.
  4. Start engine; monitor sensor voltage/temperature. Compare to expected behavior (should move with exhaust temperature).
  5. With harness access, inspect/repair any obvious damage. Wiggle wires while monitoring live data to detect intermittent opens/shorts.
  6. Remove sensor and measure its resistance at ambient; if safe, heat sensor gently (or warm engine) and confirm resistance changes. Compare to OEM spec if available.
  7. Check continuity between sensor signal and ECM pin; check for short to battery (VB) or to ground. Repair any wiring faults.
  8. If wiring and connector test good and sensor resistance/response is out of spec, replace Bank 2 Sensor 2.
  9. If new sensor does not clear code, test at ECM connector with known-good sensor or swap with the same sensor type from the other bank (if identical) to see if code follows sensor or stays with bank.
  10. If faults persist after sensor and wiring verified, inspect catalytic converter condition for signs of overheating or damage and test ECM inputs/grounds; replace or repair as required.
  11. Clear codes and perform a road test to confirm repair and that the code does not return.

Likely causes

  • Damaged wiring harness at sensor (heat, chafing, rodent, or repair damage)
  • Contaminated or corroded sensor connector pins
  • Failed thermistor element in sensor (common after age/exposure)
  • Exhaust restriction, misfire or rich operation causing high cat temps
  • Intermittent short to battery voltage on the sensor signal

Fault status

⚠️ Status
Catalyst Temperature Sensor Circuit High — Bank 2 Sensor 2 (post‑cat). Check sensor, wiring, connector, and catalytic converter temperature.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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Code

P043D

LAND ROVER P — Powertrain

Catalytic converter temperature sensor - high circuit (bank 2, sensor 2)

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Bank 2 Sensor 2 (post‑cat) temperature sensor (open/short or internal failure)
  • Wiring short to power or damaged insulation on sensor circuit
  • Corroded/loose connector or poor pin contact at sensor or ECM
  • Open or high resistance in signal, ground, or reference circuits
  • Excessive catalytic converter temperature (overheating/damage)
  • Faulty ECM or poor ECM connector/ground

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible reduced fuel economy or driveability issues if engine management adjusts
  • Exhaust smells (hot or burnt) or hotter-than-normal exhaust
  • Potential catalytic converter damage noise or rattling in severe cases
  • Stored freeze frame / sensor temperature / voltage data in scan tool

What to check

  • Retrieve freeze‑frame and live data with a capable scan tool; monitor Bank 2 Sensor 2 temperature/voltage while cold and after driving
  • Visually inspect sensor, connector and wiring harness for heat damage, corrosion, chafing or disconnection
  • Backprobe sensor connector and measure signal voltage with ignition on and engine running
  • Measure sensor resistance (if accessible) at ambient and when warmed per manufacturer spec
  • Check reference voltage and ground at the sensor connector for proper values and continuity
  • Wiggle harness while monitoring live data to look for intermittent faults

Signal parameters

  • Typical thermistor‑type post‑cat sensor produces a signal voltage that varies with temperature; expected operational range is generally within 0.2–4.8 V depending on temp and manufacturer
  • Resistance varies inversely with temperature for NTC sensors — expect a measurable change in ohms as sensor is heated/cooled (consult OEM spec)
  • Reference (sensor supply) voltage commonly ≈5.0 V or ignition/switched reference depending on system
  • Sensor ground should be near 0 V; poor ground will skew readings
  • Response time: sensor should show a steady, progressive change when exhaust temperature changes (no sudden jumps or fixed extreme readings)

Diagnostic algorithm

  1. Connect a scan tool and record freeze‑frame and live data for Bank 2 Sensor 2 (voltage and temperature). Note conditions when the code set.
  2. Perform a visual inspection: sensor, connector, wiring loom, heat shielding, and exhaust near sensor and cat.
  3. With ignition ON (engine OFF), backprobe the sensor connector: verify reference voltage and ground presence per vehicle spec.
  4. Start engine; monitor sensor voltage/temperature. Compare to expected behavior (should move with exhaust temperature).
  5. With harness access, inspect/repair any obvious damage. Wiggle wires while monitoring live data to detect intermittent opens/shorts.
  6. Remove sensor and measure its resistance at ambient; if safe, heat sensor gently (or warm engine) and confirm resistance changes. Compare to OEM spec if available.
  7. Check continuity between sensor signal and ECM pin; check for short to battery (VB) or to ground. Repair any wiring faults.
  8. If wiring and connector test good and sensor resistance/response is out of spec, replace Bank 2 Sensor 2.
  9. If new sensor does not clear code, test at ECM connector with known-good sensor or swap with the same sensor type from the other bank (if identical) to see if code follows sensor or stays with bank.
  10. If faults persist after sensor and wiring verified, inspect catalytic converter condition for signs of overheating or damage and test ECM inputs/grounds; replace or repair as required.
  11. Clear codes and perform a road test to confirm repair and that the code does not return.

Likely causes

  • Damaged wiring harness at sensor (heat, chafing, rodent, or repair damage)
  • Contaminated or corroded sensor connector pins
  • Failed thermistor element in sensor (common after age/exposure)
  • Exhaust restriction, misfire or rich operation causing high cat temps
  • Intermittent short to battery voltage on the sensor signal

Fault status

⚠️ Status
Catalyst Temperature Sensor Circuit High — Bank 2 Sensor 2 (post‑cat). Check sensor, wiring, connector, and catalytic converter temperature.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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P0420 P0430 P0138 P0137 P2370
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