P0199 — Engine Oil Temperature Sensor High
Drive with caution — fix soon.
What P0199 means
This code means the oil temperature sensor's voltage signal is higher than the normal operating range, which usually points to an open circuit, broken wiring, or a failed sensor. The typical fix is repairing the wiring or replacing the sensor. It's a common code and is usually fixable without major engine work.
Common symptoms
- Check engine light is on
- Oil temperature reads abnormally high
- Harsh or erratic transmission shifting
- Minor loss of fuel economy
- Occasional rough idle or hesitation
Common causes
- Open circuit in the sensor wiring
- Failed engine oil temperature sensor
- Corroded or disconnected sensor connector
- Broken or chafed wiring harness
- Faulty engine control module (rare)
Typical repair cost
$100 – $300
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0199 code?
Usually yes, as the engine typically still runs normally. But the bad oil temperature reading can affect shifting and engine protection, so it's smart to get it checked before long.
How much does it cost to fix a P0199 code?
Most repairs fall between $100 and $300. A wiring or connector repair is on the cheaper side, while replacing the oil temperature sensor with labor is toward the higher end.
Is a P0199 code serious?
It's moderate. The car usually still drives, but since the computer relies on accurate oil temperature for engine protection, you shouldn't ignore it long-term.
Does P0199 mean my oil is actually overheating?
Usually not. A high signal most often comes from an open circuit or failed sensor rather than truly hot oil, but it's still wise to confirm the oil level and condition during diagnosis.