Fuel Smell on Cold Start in 2020 Toyota Camry
A gasoline smell during cold start in a 2020 Camry often indicates a fuel system leak or incomplete combustion. This can be caused by a leaking fuel injector, a faulty purge valve in the EVAP system, or a rich fuel mixture due to a sensor issue. The smell is most noticeable when the engine is cold because the fuel doesn't vaporize as quickly, and the engine runs in open-loop mode, enriching the mixture.
Diagnosis Details
Possible Causes
Leaking fuel injector – A stuck or leaking injector allows raw fuel to drip into the intake or cylinder, causing a strong fuel smell on startup.
Faulty EVAP purge valve – A stuck open purge valve can draw fuel vapor from the charcoal canister into the intake, creating a fuel odor.
Rich fuel mixture due to faulty coolant temperature sensor or oxygen sensor – Incorrect readings can cause the ECU to over-fuel during cold start.
Related OBD-II Codes
Not satisfied with this diagnosis?
Try Another DiagnosisWhat To Do Next
What You Should Do
Inspect for visible fuel leaks around the engine bay and fuel rail.
Check fuel injectors for leakage using a fuel pressure gauge and leak-down test.
Test the EVAP purge valve operation with a scan tool or by applying vacuum.
Scan for diagnostic trouble codes to identify sensor issues.
If no leaks are found, have a professional diagnose the fuel trim and sensor readings.
Share this diagnosis
Help others with similar symptoms
Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
