OBD scanner shows P0130 (O2 sensor Bank 1 Sensor 1) and P0135 (O2
heated circuit
for sensor Bank1 Sensor 1).
Autozone says 1997 318is has 4 sensors. 3 before catalytic converter,
and one behind.
Crawling under the car, I only see 2. One before and one after
catalytic converter.

Questions:
1. How many O2 sensors/monitors does '97 318is really have?
2. Where is Bank 1 Sensor 1?

Thanks in advance.

To my knowledge, it should have 2, one before and one after the CAT.




"liem00" <liem00 (AT) gmail (DOT) com> wrote

Bank 1 Sensor 1 is upsteam of the catalyst.

Your car has 2 sensors, one upstream of the catalyst and one downstream
as you have observed and Jeff pointed out and as shwon below.

http://www.realoem.com/bmw/showparts...& hg=18&fg=10

liem00 wrote:

Bank 1 Sensor 1 is upsteam of the catalyst.

Your car has 2 sensors, one upstream of the catalyst and one downstream
as you have observed and Jeff pointed out and as shown below.

http://www.realoem.com/bmw/showparts...& hg=18&fg=10

liem00 wrote:

Thank you both for the valuable info.

Pashlipops wrote:

A follow-up question.
I ended up buying two universal O2 sensors (#USOS-4000) to replace the
existing ones at this place;
see the last one on the list:
http://replacement.autopartswarehous...nsor&d p=true

The old sensors have 4 wires, 2 whites, 1 black, 1 grey.
New sensors have the same number of wires and colors.
I made wire-by-wire connection, but I still get engine faults: P0130 &
P0136.
Any idea?

Thanks,
Liem

liem00 wrote: