P2085

Code

LAND ROVER P — Powertrain

Intermittent circuit of the exhaust gas temperature sensor - bank 1, sensor 2

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 19 EN: 33 RU: 30

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Causes

Broken, chafed, or damaged wiring harness to EGT sensor (bank 1, sensor 2)
Corroded, loose or water‑ingressed connector at the sensor or inline connector
Intermittent internal failure of the EGT sensor (thermistor/thermocouple or heater element)
Intermittent connector pin contact or poor crimp at the ECM connector
Short to power or ground in the sensor circuit under vibration or heat
ECM internal intermittent input/heater driver fault (less common)

Symptoms

Malfunction Indicator Lamp (MIL) / Check Engine light illuminated intermittently
Diagnostic trouble code P2085 stored (intermittent EGT circuit B1 S2)
Intermittent or erratic EGT live values on a scan tool (dropouts or jumps)
Possible regeneration/Diesel Particulate Filter (DPF) control warnings or inhibited regen (diesel applications)
Reduced drivability or limp mode in some models when ECU detects unreliable exhaust temperature feedback

What to check

Retrieve freeze frame and extended data with a scan tool; note conditions when code set
Clear code and attempt to reproduce while monitoring live EGT B1 S2 data
Visually inspect sensor, connector, and wiring along entire harness to ECM for damage, rubbing, heat exposure, soot, or corrosion
Perform wiggle test of wiring and connectors while observing live data for intermittent changes
Backprobe sensor connector and check for reference voltage, signal, ground, and heater supply (if applicable)
Measure continuity and resistance between sensor connector and ECM pin to detect intermittent opens or high resistance

Signal parameters

Live EGT reading should vary smoothly with exhaust temperature; intermittent dropouts or frozen values indicate a circuit fault
Open circuit typically shows very high resistance or 'OL' on resistance checks and may show 0 V signal or a specific diagnostic open fault in live data
Short to ground typically reads near 0 V or very low resistance (< 5 Ω) between signal and ground
Short to battery typically shows near battery voltage on signal line
Heater supply (if present) is usually switched 12 V; heater element resistance is commonly tens to low hundreds of ohms — open or near 0 Ω indicates fault (measure with connector unplugged)

Diagnostic algorithm

Record freeze frame and current live data for EGT B1 S2. Note engine temp, load, ambient conditions and recent regen cycles.
Clear codes and attempt to recreate the fault while monitoring live EGT B1 S2. Perform driving and warm‑up cycles if needed.
Visually inspect sensor, mounting, and wiring harness routing. Look for heat damage, chafing, melted insulation, soot or corrosion at connectors.
With ignition on (engine off) backprobe the sensor connector: verify presence of expected reference/heater supply voltage and good ground. Observe signal behavior while gently wiggling harness and connector.
If the sensor has a heater circuit, disconnect sensor and measure heater resistance with a DMM. Compare to expected range (open = bad, near 0 = short).
Measure signal circuit continuity from sensor connector to ECM connector; wiggle harness to detect intermittent opens/high resistance. Repair any damaged wires or pins.
Check for shorts: measure resistance between signal and ground, and signal and battery positive with ignition off.
If wiring and connectors test good but intermittent fault persists, swap or replace the EGT sensor and re‑test.
If problem remains after sensor replacement, inspect and test ECM connector pins and engine/chassis grounds. Consider ECM bench diagnostics only after wiring and sensor proven good.
Clear codes and perform road test / regeneration cycle to confirm fault does not return.

Likely causes

Damaged or rubbed wiring near exhaust heat sources causing intermittent contact
Corroded sensor connector allowing intermittent readings when wet or hot
Sensor heater or element degrading causing intermittent open/short behavior
Poor ground or intermittent connection at ECM harness connector

Fault status

⚠️ Status

P2085 — Intermittent circuit detected for Exhaust Gas Temperature Sensor Bank 1 Sensor 2. Intermittent open/short/high resistance or poor connection in sensor/heater/signal wiring or connector. Further diagnosis required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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P2085 — Intermittent circuit of the exhaust gas temperature sensor - bank 1, sensor 2