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2002 Toyota 4Runner P0440, P0441, P0446 Diagnostic and Repair Guide

Model: 02 4Runner Fault Code: P0440 Posted: 2012-04-12 06:23

The check engine light (CEL) is on, and I've retrieved fault codes P0440, P0441, and P0446. I'm currently inspecting the evaporative emission system lines. Are there any additional troubleshooting steps or common causes I should consider? Thank you for your input.

Related fault codes

P0440P0441P0446

Comments (3)

Anonymous 2012-04-12 08:29

Inspect the vent valve and its associated circuit, as a faulty vent valve is a frequent cause of P0440 and P0446 codes in 2002 Toyota 4Runners.

Anonymous 2012-04-12 09:10

Where is the vent valve located on a 2002 4Runner, and what steps should I take to test its operation?

Anonymous 2012-04-13 08:04

Do I need a service manual or diagnostic tool for accurate inspection of the evaporative system components?