- Check customer's driving habits
- Is A/C or heating system (heated seat and heated steering wheel, etc.) running constantly?
- Is tire pressure proper?
- Is excessively heavy load being carried?
- Is acceleration too much, too often?
- Inspect fuel pressure
- Inspect injector
- Inspect exhaust system
- Inspect Engine Coolant Temperature Sensor (ECTS) and circuit (Check the DTC)
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- Check the DTC
- Low fuel pressure
- Intake air leakage
- Contaminated fuel
- Weak sparks when ignited
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