P0298Engine Oil Over Temperature
- Generic OBD-II code · Powertrain
- Can trigger limp mode
- How the car detects it
- P0298 is a protection code: engine oil temperature – from its own sensor, often combined with the oil level sensor, or modelled – has exceeded the protection limit. Saab's 3.0 diesel limits injection quantity when the oil stays at 135 °C or more for over 10 s, until it cools down; a heavy-duty bus engine warns in two stages and then derates. Ford stores the code without the warning light, in line with CARB's exemption for overheat protection. Usual causes are high load in heat, cooling problems, a clogged oil cooler or stuck oil thermostat, and occasionally a sensor reading too high.
- What you may notice
- Reduced power, quantity limited
- Oil temperature warning
- Usually no check engine light
- Likely causes
- LikelyHigh load in heat (trailer, mountain pass, stop-and-go)
- PossibleCooling or fan problem (clogged radiator, fan, thermostat, low coolant)
- PossibleOil cooler clogged or oil thermostat stuck
- PossibleOil temperature or level sensor reading too high
- RareLow oil level or wrong oil
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.