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

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Tibur Waltson - 27 May 2004 13:57 GMT

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.
http://tinyurl.com/23bgj

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Woody - 27 May 2004 14:47 GMT

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

> This Maxima failed the MIL/check engine light due to
> a warning lamp failure. The fault codes reads:
[quoted text clipped - 17 lines]
> smog due to MIL. See detail report here.
> http://tinyurl.com/23bgj

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Tibur Waltson - 28 May 2004 12:23 GMT

>"Woody" <TheDuck@pond.net>
>> "Tibur Waltson" <apple26pie@yahoo.com>

> > P0141 O2 Sensor Heater Circuit
> > Malfunction (Bank 1 Sensor2)

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

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

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Tibur Waltson - 30 May 2004 01:29 GMT

>"Tibur Waltson" <apple26pie@yahoo.com> wrote in message
> >"Woody" <TheDuck@pond.net>
> >> "Tibur Waltson" <apple26pie@yahoo.com>

> 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?

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

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name - 30 May 2004 13:58 GMT

> is finding which is setting the fault code. Any suggestions
> on which one of the four O2 sensors blew
> the heater circuit?

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

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