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Home / DTC / P0436 — Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 1

P0436 — Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 1

Detailed page for trouble code P0436.

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Code

P0436

Generic P — Powertrain

Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 1

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

Causes

  • Faulty catalyst temperature sensor (Bank 2, sensor 1)
  • Open or short in sensor wiring or poor continuity to PCM
  • Corroded, bent or contaminated connector pins
  • High heat damage to sensor or harness (melting/chafing)
  • Exhaust leak upstream of the sensor altering readings
  • Incorrect/replacement sensor installed (wrong spec)

Symptoms

  • Check Engine Light (MIL) illuminated; code P0436 stored
  • Possible failed emissions test or catalyst monitoring fault
  • Often no obvious driveability symptoms (engine may run normally)
  • Possible intermittent MIL if wiring is intermittent
  • In some vehicles, related catalytic efficiency codes (P0430/P0420) or O2/heater codes may also set

What to check

  • Retrieve freeze frame and live data for Bank 2 Sensor 1 catalyst temperature; compare to Bank 1 Sensor 1 and expected behavior during warm-up
  • Visual inspection of the sensor, wiring harness and connector for damage, corrosion, heat-sheathing failure
  • Backprobe sensor connector to measure signal voltage and heater voltage (if equipped) with ignition ON and engine running
  • Measure sensor resistance when cold and when hot (if manufacturer resistance chart available) to confirm thermistor behavior
  • Check continuity and for shorts between sensor signal, sensor ground, and battery voltage to the PCM connector
  • Inspect for exhaust leaks upstream of the sensor and repair if found

Signal parameters

  • Type: thermistor (temperature-dependent resistance) or temperature sensor producing 0–5 V signal depending on design
  • Typical behavior: resistance decreases as temperature increases (inverse relationship); voltage changes accordingly
  • Expected: measurable change in reported temperature/voltage as exhaust warms up during cranking and after start
  • Fault indications: fixed/stuck value, open circuit (no signal), short to ground or battery (signal near 0 V or near supply), or values inconsistent with Bank 1

Diagnostic algorithm

  1. Read and record DTCs, freeze frame, and live catalyst temperature data for Bank 1 and Bank 2 Sensor 1. Note conditions when code set (rpm, load, temperature).
  2. Clear codes, perform controlled drive or warm-up while monitoring live data for Bank 2 Sensor 1 behavior vs Bank 1. Confirm reproducibility.
  3. Visually inspect the Bank 2 sensor, its harness, and connector for corrosion, heat damage or broken wires. Repair obvious damage.
  4. With connector disconnected, measure sensor resistance (if manufacturer spec available) at ambient and after warming; verify resistance changes with temperature. If no change, suspect sensor failure.
  5. Backprobe the sensor connector with ignition ON/engine running: check signal voltage and (if present) heater supply/ground. Verify values change as exhaust temp changes.
  6. Check continuity between the sensor signal/ground wires and the PCM connector; check for shorts to battery or chassis ground.
  7. Inspect and repair any exhaust leaks upstream of the sensor that could skew readings.
  8. If wiring and connector check OK but sensor readings remain out of range, replace the Bank 2 Sensor 1 catalyst temperature sensor with correct OEM specification.
  9. After repair, clear codes and verify with a full warm-up and test drive until readiness monitors complete. Re-scan to confirm the fault does not return.
  10. If issue persists after sensor and wiring replacement, check for PCM faults, software updates, or consult manufacturer-specific diagnostics.

Likely causes

  • Failed/shorted thermistor element in the sensor
  • Broken wire, damaged insulation or short to ground/power in harness
  • Connector corrosion or poor pin contact
  • Heat-related damage where the harness runs near the exhaust
  • Exhaust leak allowing cooler/warmer gases to affect the reading

Fault status

⚠️ Status
Catalyst Temperature Sensor Circuit Range/Performance — Bank 2 Sensor 1. PCM detected sensor signal out of expected range, inconsistent response, or circuit fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P0436

LAND ROVER P — Powertrain

Catalyst temperature sensor - range/performance of the circuit (bank 2, sensor circuit 1)

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

Causes

  • Faulty catalyst temperature sensor (Bank 2, sensor 1)
  • Open or short in sensor wiring or poor continuity to PCM
  • Corroded, bent or contaminated connector pins
  • High heat damage to sensor or harness (melting/chafing)
  • Exhaust leak upstream of the sensor altering readings
  • Incorrect/replacement sensor installed (wrong spec)

Symptoms

  • Check Engine Light (MIL) illuminated; code P0436 stored
  • Possible failed emissions test or catalyst monitoring fault
  • Often no obvious driveability symptoms (engine may run normally)
  • Possible intermittent MIL if wiring is intermittent
  • In some vehicles, related catalytic efficiency codes (P0430/P0420) or O2/heater codes may also set

What to check

  • Retrieve freeze frame and live data for Bank 2 Sensor 1 catalyst temperature; compare to Bank 1 Sensor 1 and expected behavior during warm-up
  • Visual inspection of the sensor, wiring harness and connector for damage, corrosion, heat-sheathing failure
  • Backprobe sensor connector to measure signal voltage and heater voltage (if equipped) with ignition ON and engine running
  • Measure sensor resistance when cold and when hot (if manufacturer resistance chart available) to confirm thermistor behavior
  • Check continuity and for shorts between sensor signal, sensor ground, and battery voltage to the PCM connector
  • Inspect for exhaust leaks upstream of the sensor and repair if found

Signal parameters

  • Type: thermistor (temperature-dependent resistance) or temperature sensor producing 0–5 V signal depending on design
  • Typical behavior: resistance decreases as temperature increases (inverse relationship); voltage changes accordingly
  • Expected: measurable change in reported temperature/voltage as exhaust warms up during cranking and after start
  • Fault indications: fixed/stuck value, open circuit (no signal), short to ground or battery (signal near 0 V or near supply), or values inconsistent with Bank 1

Diagnostic algorithm

  1. Read and record DTCs, freeze frame, and live catalyst temperature data for Bank 1 and Bank 2 Sensor 1. Note conditions when code set (rpm, load, temperature).
  2. Clear codes, perform controlled drive or warm-up while monitoring live data for Bank 2 Sensor 1 behavior vs Bank 1. Confirm reproducibility.
  3. Visually inspect the Bank 2 sensor, its harness, and connector for corrosion, heat damage or broken wires. Repair obvious damage.
  4. With connector disconnected, measure sensor resistance (if manufacturer spec available) at ambient and after warming; verify resistance changes with temperature. If no change, suspect sensor failure.
  5. Backprobe the sensor connector with ignition ON/engine running: check signal voltage and (if present) heater supply/ground. Verify values change as exhaust temp changes.
  6. Check continuity between the sensor signal/ground wires and the PCM connector; check for shorts to battery or chassis ground.
  7. Inspect and repair any exhaust leaks upstream of the sensor that could skew readings.
  8. If wiring and connector check OK but sensor readings remain out of range, replace the Bank 2 Sensor 1 catalyst temperature sensor with correct OEM specification.
  9. After repair, clear codes and verify with a full warm-up and test drive until readiness monitors complete. Re-scan to confirm the fault does not return.
  10. If issue persists after sensor and wiring replacement, check for PCM faults, software updates, or consult manufacturer-specific diagnostics.

Likely causes

  • Failed/shorted thermistor element in the sensor
  • Broken wire, damaged insulation or short to ground/power in harness
  • Connector corrosion or poor pin contact
  • Heat-related damage where the harness runs near the exhaust
  • Exhaust leak allowing cooler/warmer gases to affect the reading

Fault status

⚠️ Status
Catalyst Temperature Sensor Circuit Range/Performance — Bank 2 Sensor 1. PCM detected sensor signal out of expected range, inconsistent response, or circuit fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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