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#1
05-13-2005, 08:05 PM
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Need help with 2000 4-Runner O2 snesor
I have a 2000 4-Runner with a check engine light, Toyota said it was reporting a "lean" mixture and told me that it was because of the brand of gas I was running, or a bad O2 sensor.
1 - how many o2 sensors are on a 2000 4-Runner, there are, what looks like 2 - one before the cat and one after?!?! 2 - if there is only 1, which one is it, front or back? Thanks Tim 
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#2
05-13-2005, 08:59 PM
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Re: Need help with 2000 4-Runner O2 snesor
Welcome to the AF!
What code did the ECM report? Other things can cause a lean error code besides the HO2/A-F Ratio sensor. (There are two sensors, one before and one after the cat. converter)
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Forum Guidelines:http://www.automotiveforums.com/vbulletin/guidelines.html "What we've got here is a failure to communicate"
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#3
05-14-2005, 02:48 PM
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Re: Re: Need help with 2000 4-Runner O2 snesor
Quote:
With there being two sensors, should I replace them both at the same time?
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#4
05-14-2005, 08:01 PM
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Re: Need help with 2000 4-Runner O2 snesor
No, they have different functions.
I bet the code is P0171. Read this thread: http://www.automotiveforums.com/vbul...d.php?t=405771 If it turns out to be an HO2 sensor, then make sure you get the right one. Some trucks have the HO2 sensor and some have the A/F ratio sensor. Get the correct part number from Toyota parts department with your VIN.
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Forum Guidelines:http://www.automotiveforums.com/vbulletin/guidelines.html "What we've got here is a failure to communicate" Last edited by Brian R.; 05-15-2005 at 12:03 PM.
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