Knock Sensors - Replace sensor or harness?

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Aug 18, 2011 | 01:13 PM

tek-rookie

Thread Starter

Driver School Candidate

Joined: May 2009

Posts: 6

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From: OH

Knock Sensors - Replace sensor or harness?

I have a 2000 RX 300 (155K miles) and it won't go into shift into overdrive. I took it to a mechanic and the diagnostics came back with a PO 171 Fuel System Lean and PO 325 Knock Sensor Bank 1.

They cleaned the mass air flow sensor for me. But, I am debating on replacing the harness or (2) Knock Sensors, based on feedback from the dealer and readings.

I took the car to my trusty independent garage mechanic and got CEL codes on both Knock Sensors now. He tested the sensors and they read fine. Is there a way to read the codes after putting on the harness?

Has anyone heard of issue with knock sensors going bad? Or a site the sells economical sensors. The dealer is charging $200 each.

Aug 18, 2011 | 02:00 PM

hypervish

Lexus Test Driver

Joined: Aug 2009

Posts: 5,723

Likes: 114

From: NJ

Yup, knock sensors can lock you out of Overdrive. We've had "many" people run into this, just replace the sensor and you should be fine.

Aug 18, 2011 | 03:39 PM

salimshah

CL Community Team

Joined: Apr 2001

Posts: 16,533

Likes: 1,379

From: Austin, TX

There is enough effort and if you replace the recommend parts, you should replace both senors and harnesses. No point in repeating the effort in few months.

Salim

Aug 18, 2011 | 04:03 PM