Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble getting a steady reading from the sensor that tells it how hot the engine oil is. It's like a thermometer that sometimes works and sometimes doesn't.
The P0199 code indicates that the Engine Control Module (ECM) is receiving intermittent or erratic signals from the engine oil temperature sensor.
The Engine Oil Temperature (EOT) sensor measures the temperature of the engine oil and sends this information to the ECM. If the ECM detects that the signal from the EOT sensor is intermittent or erratic, it will trigger the P0199 code. This could be due to wiring issues, a faulty sensor, or poor connections.
• Check Engine Light illuminated
• Engine running rough
• Poor fuel economy
• Faulty engine oil temperature sensor
• Wiring issues or poor connections in the sensor circuit
• Faulty ECM
ECM: Engine Control Module
EOT: Engine Oil Temperature
• Use an OBD-II scanner to verify the code.
• Inspect the wiring and connections to the EOT sensor.
• Test the EOT sensor for proper operation.
• Replace the engine oil temperature sensor.
• Repair or replace damaged wiring or connectors.
• Replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance and inspection of engine sensors.
• Ensure proper oil levels and quality.
• Check wiring and connections periodically.
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light comes on.
• Avoid driving the vehicle hard until the issue is resolved.
Warranty coverage may vary; check with your vehicle manufacturer or dealer.
This code has been more prevalent with vehicles that have higher mileage or those that have not had regular maintenance.
Moderate – It is advisable to address this issue soon to avoid potential engine damage.
Driving with this code may lead to engine performance issues and should be addressed to ensure vehicle safety.
• Engine at operating temperature
• Vehicle in idle or low-speed conditions
The engine oil temperature sensor is typically located near the oil filter or oil pan.
Q: Can I drive with a P0199 code?
A: It's possible to drive with this code, but it's not recommended as it may lead to engine performance issues.
Q: How do I reset the Check Engine Light after fixing the issue?
A: You can reset the Check Engine Light using an OBD-II scanner after the issue is resolved.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.