Fault codeP0199

MODERATE

Engine Oil Temperature Sensor Intermittent

What this code means

Engine Oil Temperature Sensor Intermittent.

P0199 is a generic code: it means the same thing on every make. P0199 belongs to family P01xx — Fuel and air metering. Its page explains how to read a code and groups all its codes by part.

Type of fault

The signal drops out or jumps from time to time. This is typical of a poor contact: a loose or corroded connector, or a chafed wire that touches intermittently, often triggered by vibration or heat. The fault may disappear and come back; checking the wiring with the engine running is often revealing.

Engine oil temperature sensor

This sensor measures the temperature of the engine oil. The control unit uses it to protect the engine, for example by limiting power when the oil is too hot, to control variable valve timing or, on some cars, to calculate the oil change interval.

What you notice

Usually nothing in driving; sometimes a warning on the dashboard or power limited as a precaution.

How to check it

Check the oil level first, then the sensor's connector, often on the oil filter housing or the sump. Engine warm, Klaro's oil temperature should be close to the coolant temperature, often slightly higher after a long drive.

Watch it live in Klaro

With an OBD2 adapter plugged in, these live readings show the part at work, when your car reports them:

Engine oil temperature
Coolant temperature

What to do

Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.

Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back. Clearing a fault code yourself →

How to read this code

PPowertrain
0standardised code
1Fuel and air metering
99P0199