1. Home
  2. Nissan Maxima Forum
  3. How to locate bad O2 sensor base solely on MIL codes. Maxima `97 Nissan

How to locate bad O2 sensor base solely on MIL codes. Maxima `97 Nissan

This Maxima failed the MIL/check engine light due to a warning lamp failure. The fault codes reads:

P0325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor) and P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor2)

With four sensors, one on each side of the motor and two before and after the catalytic converter, the mystery is finding which is setting the fault code. Any suggestions on which one of the four O2 sensors blew the heater circuit?

Thanks

Model-Year: 1997 Make:NISSAN Model:MAXIMA State:CA VIN: JN1CA21D3VT876626 Engine Size: 3.OL Transmission: MANUAL Test Weight: 3375 Cylinders: 06 Odometer: 126,816. Failed smog due to MIL. See detail report here.

formatting link

Reply to
Tibur Waltson
Loading thread data ...

Bank one is the side of engine with no 1 cylinder. Sensor 2 is the second sensor, usually after converter..

Reply to
Woody

Thanks. This will speed up the repair very much.

One California dealer quoted each O2, of four separate kinds, for $135. Another dealer quoted $170 but says it's a "One size fits all type." Anyone know why it's sold like this?

Thanks

Reply to
Tibur Waltson

Just found out the O2 after the converter is a four pin. The upstream O2 are three pin. Here's some useful info:

gray - = O2 input white- = heater black + = output, white + = heater

white = - heater, gnd black = O2 + output white = + heater

Tibur

Reply to
Tibur Waltson

Measure the resistance of the heater circuits. If one is blown, it will be open. Or maybe it's a bad connection somewhere else.

Reply to
name

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.