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Hello We are trying to find to the location of the "upstream 02 sensor code PO135" to replace.

Vehicle: 1998 nissan quest 3.0 v6

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HI there

This code is for the bank 1 sensor 1 heater circuit. Typically the problem is the O2 sensor. Bank 1 is the rear bank closest to the firewall, sensor 1 is the sensor BEFORE the converter on that pipe.

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