Fault code P0196 – a step-by-step guide to diagnosing and fixing it

Error code P0196 is displayed and the check engine light is on - what does this mean?

The OBD system detects a fault in the engine oil temperature sensor circuit that is outside the normal operating range. This DTC P0196 indicates a problem with the sensor that monitors the oil temperature and transmits this information to the engine control unit. For various manufacturers, this trouble code may also be referred to as "Engine Oil Temperature Sensor Circuit Range/Performance".

What causes can this error code have?

• Defective engine oil temperature sensor
• Damaged or corroded cable connections to the sensor
• Loose or poor plug connections
• Short circuit in the wiring of the sensor system
• Defective engine control unit (ECM/PCM)
• Engine oil level too low or too high
• Use of incorrect oil viscosity
• Engine overheating due to other defects

What symptoms occur in parallel with fault code P0196?

• Check engine light: Permanent activation of the check engine light
• Irregular engine running: Jerking or unsteady idling
• Poor fuel efficiency: Increased consumption due to incorrect engine management
• Starting problems: Difficulty starting the engine when cold
• Overheating protection: Engine goes into emergency running mode
• Incorrect temperature display: Unrealistic values on the dashboard

How can the problem with fault code P0196 be resolved?

• There are several proven solutions that can be systematically applied to rectify this fault code.
• Check the oil level and quality: Check the engine oil level and top up with the correct viscosity if necessary, as incorrect oil levels can falsify the sensor measurements
• Clean the sensor plug: Disconnect the plug connection of the oil temperature sensor, clean the contacts with contact spray and reconnect firmly
• Check the wiring: Check the wiring harness from the sensor to the control unit for damage, breaks or corrosion and repair any defective areas
• Replace sensor: Replace the engine oil temperature sensor completely, as internal defects are often irreparable
• Carry out a control unit reset: After the repair, delete the EOBD fault memory and carry out a test drive to check the repair
• Professional diagnosis: If code P0196 recurs, visit a specialist workshop, as the engine control unit may be faulty