Car symptom
Loss of power
The car feels flat. Power loss usually comes from boost, fuel, ignition or a dragging brake.
Most likely causes
- Boost leak or wastegate fault
- Clogged fuel filter / weak pump
- Spark plugs or coils worn
- Clogged catalyst
- Dragging brakes
Checks to run
- Read OBD codes
- Pressure-test the intake
- Check fuel pressure under load
- Spin-test the wheels for drag
Tools you may need
OBD-II scanner
Boost leak tester
Fuel pressure gauge
Confirm before replacing. These are hypotheses to check — never buy parts on a guess. If the fault involves brakes, airbags or fuel under pressure, use a professional.
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FAQ
It depends on the cause. Some causes are cheap and quick; others (like a head gasket or seized caliper) need attention soon. Work through the checks in order and confirm before replacing parts.
Start with the free checks listed here. If they involve high voltage, fuel under pressure, airbags or brakes, let a professional handle it.
The interactive diagnostic asks targeted questions to narrow it down, and every cause must be confirmed with a measurement — never guess.