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| Symptom | Likely OBD Code | Cheap Fix (VND) | |---------|----------------|------------------| | Không tải lúc nóng (rough idle hot) | P0171 (System too lean) | Clean MAF (200k) | | Tốn xăng + hôi xăng (smelly + high fuel) | P0420 (Catalyst efficiency) | Replace O2 sensor (600k-1.2M) | | Mất lực khi ôm cua (power loss cornering) | P0335 (Crank position sensor) | Clean sensor (free) |