P0195

Code

LAND ROVER P — Powertrain

Engine oil temperature sensor circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 30 EN: 83 RU: 49

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Page language: EN

Causes

Failed engine oil temperature (EOT) sensor (NTC thermistor)
Open, short or high-resistance wiring between sensor and PCM
Corroded, contaminated or loose sensor connector
Oil contamination or sensor immersion issue (sensor body fouled with debris/oil sludge)
Damaged sensor threads or improper installation/ sealing
Faulty PCM or poor PCM ground/reference (less common)

Symptoms

Malfunction Indicator Lamp (MIL/CEL) illuminated
Incorrect oil temperature reading on dash or gauge
Cold‑start enrichment or warm‑up strategies affected (hard starts, poor idle or drivability until engine warms)
Possible erratic engine management or transmission shift behavior if module uses oil temp input
Possible stored pending faults or multiple related temp-sensor codes

What to check

Read and record DTCs and freeze-frame data; note engine temperature and operating conditions when code set
Visual inspection of EOT sensor and wiring harness for damage, oil contamination, loose connector or corrosion
Backprobe sensor connector and check for reference voltage (if applicable) and signal voltage with key ON/engine OFF
Measure sensor resistance at connector and compare to sensor specification (resistance should change with temperature)
Check continuity and resistance of wiring between sensor connector and PCM pins; check for shorts to battery + and ground
Verify PCM grounds and power supplies related to the sensor circuit

Signal parameters

Sensor type: typically a temperature-dependent resistor (NTC thermistor) — resistance decreases as temperature rises
Typical behavior (example): High resistance at cold, low resistance at hot; signal voltage to PCM varies accordingly via pull-up or reference circuit
Common PCM input voltage range: ~0.1 V (hot/low resistance) to ~4.9 V (cold/high resistance) depending on circuit design
Resistance examples (typical, not manufacturer-specific): cold (~20 °C) = kiloohm range; hot (~100 °C) = low hundreds of ohms — consult Land Rover spec for exact values
Response: relatively slow compared with speed sensors — smooth change as oil temperature changes

Diagnostic algorithm

Retrieve full DTC list and freeze-frame; note conditions when code set (engine temp, oil temp reading, mileage).
Perform a visual inspection of sensor, connector and harness for signs of oil, corrosion, damage or loose fitment.
With ignition OFF and engine cooled, disconnect the EOT sensor connector. Inspect terminals for corrosion, bent pins or oil ingress. Clean and reseat connector.
Measure sensor resistance at the sensor body (or at back of connector) at ambient temp. Warm engine carefully and recheck resistance to confirm it changes with temperature. Compare to Land Rover spec if available.
With harness connected, backprobe the signal and reference/ground wires. With key ON (engine OFF) verify reference voltage or pull-up voltage and good ground. With engine warming, observe signal voltage change consistent with rising oil temperature.
Check for opens/shorts: measure continuity between sensor connector and PCM pins; check for shorts to +B and ground. Wiggle harness to try to reproduce intermittent faults.
If wiring and connector check good but sensor readings are out of expected range, replace the oil temperature sensor. Use correct torque and oil‑safe thread sealant as required.
After repair, clear codes, perform functional test / road test to ensure code does not return and that ECU receives correct oil temperature signal.
If fault persists after sensor and wiring verified, perform PCM diagnostics per Land Rover procedures or consult manufacturer technical service bulletins.

Likely causes

Broken or chafed harness leading to open/short to battery or ground
Corroded terminal(s) inside the sensor connector allowing intermittent contact
Sensor failure from heat, oil contamination or age
Connector pushed off or not fully seated after service
PCM reference voltage or ground fault

Fault status

⚠️ Status

Engine oil temperature sensor circuit malfunction — open, short, or out-of-range signal detected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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P0195 — Engine oil temperature sensor circuit