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Describe the problem
Lubock analyses the causes and guides you through the checks
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Likely causes
- 1Clogged air or fuel filter
- 2Dirty or faulty MAF sensor
- 3Turbo struggling
Checks to perform
- Check the air filter and replace it if very dirty.
- Watch consumption: an unexplained rise often accompanies power loss.
- Note whether the check engine light comes on and read the OBD-II code.
- Look for obvious leaks in the turbo hoses (whines, loose connections).
A power loss shows as lack of punch, trouble uphill or the engine not revving out. Causes range from air to fuel to turbo. Check in order from the simplest (filters) to the priciest components.
Clogged air or fuel filter
A very dirty air filter chokes the engine and cuts power. A clogged fuel filter (especially on diesels) limits fuel flow. A cheap fix that's often the answer.
Dirty or faulty MAF sensor
A dirty mass airflow sensor sends wrong readings to the ECU, which trims injected fuel: the car loses urge. Cleaning with specific spray may be enough.
Turbo struggling
Progressive power loss, exhaust smoke and abnormal whine can mean a turbo not boosting (stuck variable geometry, pressure leak, wastegate). Needs dedicated diagnosis.
Oxygen sensor or EGR
A faulty oxygen sensor mis-mixes air and fuel; an EGR stuck open cuts efficiency. Both often trigger the check engine light.
Coils or spark plugs
On petrol, a faulty coil or plug makes the engine run on fewer cylinders: power drops and you feel vibrations, especially under load.
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