Fuel smell in the exhaust

Tiny
PH KONG
  • MEMBER
  • 2010 MITSUBISHI LANCER
  • 2.0L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
I had my gearbox replaced about a month ago and since then, there is a strong smell of petrol from the exhaust. What can be the cause?
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Thursday, January 3rd, 2019 AT 6:42 AM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi and thanks for using Overdrive

They would have had to remove the exhaust system. Check and confirm that the oxygen sensors are connected and the wiring isn't damaged.

I attached 3 pictures to help you locate the sensors. Check all of them.

Note: If the check engine light is staying on while the engine is running, you need to have the computer scanned to determine the diagnostic trouble code. Here is a quick video that shows how it is done:

https://youtu.be/YV3TRZwer8k

Here are a couple links that describe what an oxygen sensor does and how one is replaced:

https://www.2carpros.com/articles/how-an-oxygen-sensor-works

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Also, I would like you to check one more thing if the sensors are good. The engine coolant temperature sensor can be causing issues and I feel confident that it was disconnected too. The last picture I attached shows its location. Make sure it is connected and there is no wiring damage.Take a look through these links for symptoms and how one is replaced.

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Let me know if this helps.

Joe
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Thursday, January 3rd, 2019 AT 9:31 PM

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