Engine and gearbox (P)
P219A: Lean condition at cruise
This code indicates that the engine is running lean during cruising or low load conditions. This means there is too much air and not enough fuel in the air-fuel mixture.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Engine hesitation
- Poor fuel economy
- Rough idle
- Check engine light on
Common causes
- Air leak in intake system
- Faulty oxygen sensor
- Weak fuel pump
- Clogged fuel filter
- Faulty mass air flow sensor
How to check it yourself
- Inspect intake hoses and connections for leaks
- Check oxygen sensor readings
- Test fuel pump pressure
- Replace fuel filter if clogged
- Inspect mass air flow sensor for dirt or damage
Can I keep driving?
The car can be driven, but prolonged driving with a lean condition may cause engine damage.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer