Fault code P0197 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0197 – Engine Oil Temperature Sensor Low

P0197: Causes, signs and repairs

Error code P0197 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system detects a fault in the engine oil temperature sensor circuit, which is classified as "Engine Oil Temperature Sensor Circuit Low". This DTC P0197 indicates that the control unit is receiving too low a signal from the engine oil temperature sensor. For various manufacturers, this fault code may also be referred to as an oil temperature sensor fault or engine oil temperature circuit fault.

What causes can this fault code have?

Defective engine oil temperature sensor
Damaged or corroded cable connections to the sensor
Short circuit in the sensor wiring
Loose or dirty plug connections
Defective engine control unit (ECU/PCM)
Broken ground wire of the sensor
Dirty or clogged sensor due to oil sludge

What symptoms occur in parallel with fault code P0197?

Check engine light: Permanent activation of the check engine light
Irregular idling: Engine runs unevenly or stutters at idle speed
Poor engine performance: Reduced acceleration and power delivery
Increased fuel consumption: Inefficient combustion due to incorrect oil temperature values
Starting problems: Difficult cold start at low temperatures
Incorrect temperature display: Unrealistic oil temperature values in the display

How can the problem with error code P0197 be rectified?

The repair requires a systematic diagnosis to identify the exact cause.
Replace the engine oil temperature sensor completely and have the new sensor calibrated
Check all cable connections to the sensor, repair or replace damaged cables
Clean plug connections, treat contacts with contact spray and screw tight
Carry out a multimeter test of the sensor voltage and replace the wiring if there are any deviations
Check engine control unit for defects and replace or reprogram if necessary
Change the engine oil and oil filter to remove dirt from the sensor
Use OBD scanner to delete fault memory and recalibrate system after repair

FAQ - Frequently asked questions about DTC P0197

Can I continue driving with error code P0197?

Driving is possible in the short term, but you should visit a workshop as soon as possible. The code P0197 can lead to engine damage as the oil temperature monitoring system is not working correctly.

How much does it cost to repair error code P0197?

The costs vary depending on the cause: A new oil temperature sensor costs 30-80 euros, labor costs around 50-100 euros. Cable repairs can cost an additional 100-200 euros.

How can I diagnose fault code P0197 myself?

You can read out the code using an OBD scanner. First check the plug connections on the sensor and measure the voltage with a multimeter. However, professional diagnosis is recommended.

Does error code P0197 occur more frequently in certain weather conditions?

Yes, the code can occur particularly in cold temperatures or extreme heat, as the sensor then has to provide more precise values and defective components are more likely to be noticed.

Can an incorrect oil type cause error code P0197?

Indirectly yes, as the wrong oil can lead to deposits on the sensor. Always use the engine oil recommended by the manufacturer with the correct viscosity.

How often should the oil temperature sensor be serviced?

The sensor itself is maintenance-free, but you should have the connections checked every time you change the oil. Regular oil changes prevent contamination of the sensor.

Vehicles in which error code P0197 occurs most frequently

Error code P0197 is a standardized EOBD trouble code for problems with the engine oil temperature sensor and can occur in various vehicle brands, but is most common in the following vehicles:

BMW: 3 Series E90/E91, 5 Series E60/E61, X3 E83, X5 E70 (2005-2013)
Mercedes-Benz: C-Class W204, E-Class W211/W212, ML-Class W164 (2007-2015)
Audi: A4 B7/B8, A6 C6/C7, Q5 8R, Q7 4L (2006-2014)
Volkswagen: Golf V/VI, Passat B6/B7, Tiguan 5N, Touareg 7P (2005-2012)
Ford: Focus MK2/MK3, Mondeo MK4, Kuga MK1, S-Max (2007-2015)
Opel: Astra H/J, Insignia A, Zafira B, Vectra C (2004-2013)
Peugeot: 307, 308, 407, 508, 3008 (2005-2014)
Citroën: C4, C5, C-Crosser, DS4 (2006-2013)
If the code P0197 occurs in your vehicle, you should not hesitate and visit a specialist workshop as soon as possible. An early diagnosis can prevent expensive consequential damage to the engine and keep repair costs low. A regular check of the oil temperature sensor is particularly recommended for older vehicles of the brands mentioned.

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