What Causes Exhaust Smell Inside the Car?

[JacksonLee]

Reasons for exhaust smell inside the car are as follows: Excessively rich air-fuel mixture: Incomplete combustion leads to excessive exhaust emissions. It's necessary to check the air filter, oxygen sensor, and throttle position sensor. Activation of external circulation mode: When the vehicle is in motion with external circulation mode activated, exhaust gases produced during engine operation may enter the cabin. Proper adjustment of internal/external circulation settings while driving is required. Timely inspection and maintenance of the engine emission system pipelines should be performed. Damaged intake or exhaust pipes: Inspect the vehicle's intake system pipes and exhaust pipes for any damage. Prompt pipe inspection and repairs should be conducted. Excessive carbon buildup: Throttle body carbon deposits or poor fuel quality. Regularly clean carbon deposits from the throttle body and cylinders, and use high-quality gasoline.