Powertrain, generic · Fuel and air metering

P0196 Engine Oil Temperature Sensor A Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

The engine oil temperature sensor A is an NTC thermistor fed with 5 V through a resistor: the hotter the oil, the lower the signal voltage. The engine module uses the oil temperature for variable cam timing (Ford disables it with cold oil or a sensor fault), engine protection and the oil life monitor; many engines have no such sensor and use a calculated oil temperature instead. P0196 means the signal is electrically valid but implausible – stuck, offset or rising wrongly. GM's LT4 runs three tests: after a cold soak oil, coolant and intake air must agree within 16 °C; during warm-up the oil must reach 90 °C after enough air mass; and continuously it is compared with a model (fault above 30 °C); two trips. Saab expects at least 50 °C once coolant has held 80 °C for 3 min. Caution: on Ford's 2023 diesels P0196 actually checks the coolant sensor against oil temperature (35 °C after 6 h), and Nissan traced it on the Rogue to a faulty coolant control valve.

Likely causes

Oil temperature sensor drifting or stuck (offset)
Comparison sensor (coolant, intake air) or its wiring wrong
Thermal management or coolant control valve, or thermostat faulty (oil genuinely too hot or cold)
Contact resistance in the connector
Control module software

Symptoms

  • Check engine light on (usually after two drives)
  • Implausible oil temperature reading
  • Possibly a cam timing code alongside
  • Often no noticeable symptoms

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–450
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

engine oil temperature sensorsensor wiringcoolant control valve

Related codes

P0195P0197P0198P0116P0128P01BA

References: law.cornell.edu, gsi.ext.gm.com, fordservicecontent.com, saabwisonline.com.