Persistent CEL 171 - need help
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Instructor
Joined: Jan 2006
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From: Virginia
Persistent CEL 171 - need help
1999 RX300, 260K miles. Recently threw a 171. Replaced the firewall side O2 sensor with Denso 234-9009. Cleaned the intake duct MAF sensor with appropriate CRC cleaner. New gas cap. Code persists, suggesting a vacuum leak. Removed the shroud that covers the top of the engine and inspected flexible lines but found no evidence of a leak. Help! What do I do next?
Last edited by JAB; Aug 11, 2020 at 12:13 PM. Reason: typo
Racer
Joined: Oct 2009
Posts: 1,299
Likes: 324
From: nj
1999 RX300, 260K miles. Recently threw a 171. Replaced the firewall side O2 sensor with Denso 234-9009. Cleaned the intake duct MAF sensor with appropriate CRC cleaner. New gas cap. Code persists, suggesting a vacuum leak. Removed the shroud that covers the top of the engine and inspected flexible lines but found no evidence of a leak. Help! What do I do next?
In my case a MAF sensor change fixed it
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