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Need help with code 5 on my 87 4 runner 22re

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Old 02-02-2009, 07:41 AM
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Question Need help with code 5 on my 87 4 runner 22re
I have replace my o2 sensor 2 times now and it still is throwing code 5 (oxygen sensor signal) My check engine light only comes on mainly on the highway/freeway at a steady speed/rpm +/- 500rpm.
I use denso o2 sensors and thier direct fit oe ones too. The wiring is all good as well.

I don't know what to do please help....
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Old 07-10-2023, 07:09 PM
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Ever found the issue ?
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Old 07-12-2023, 12:33 PM
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That's a lean situation... you can change the AFM and stop that from happening. I know because I've done it.
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Old 07-16-2023, 12:14 AM
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You have a vacuum leak. DO NOT F- around with the AFM to compensate. Check all of the vacuum motors with a vacuum pump, then grab a cigar and....




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