Smoke Test
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Driver School Candidate
Joined: Jun 2009
Posts: 1
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From: TN
Smoke Test
Hello, I'm new to the forum and hope this ends up on the ES300 Forum. I recently had the check engine light. The mechanic ran the diagnostic which showed P0441, P0442, P0446. I understand what I need to do to troubleshoot those diagnostic codes. Here's my question: The mechanic ran a "Smoke Test" on the evap system. It came with a $90 charge. Was the test necessary? Thanks
Lexus Test Driver
Joined: Nov 2006
Posts: 1,410
Likes: 1
From: SoCal
Well the codes you mentioned are evap leak codes within the evap system.
The smoke test basically goes through a vacuum hose or whatever, and sends smoke into the "leak free" evap system. Then you wait and see where the smoke leaks from, and that will be the culprit.
I'd say its a necessary first step into diagnosing the problem.
The smoke test basically goes through a vacuum hose or whatever, and sends smoke into the "leak free" evap system. Then you wait and see where the smoke leaks from, and that will be the culprit.
I'd say its a necessary first step into diagnosing the problem.
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