Where's O2 Sensor Bank 1 Sensor 1 for 1997 318is?

Question

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:

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

Thanks in advance.

Jeff Strickland · Accepted Answer

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

Pashlipops · Answer

Bank 1 Sensor 1 is upsteam of the catalyst.Your car has 2 sensors, one upstream of the catalyst and one downstreamas you have observed and Jeff pointed out and as shwon below. wrote:

Pashlipops · Answer

Bank 1 Sensor 1 is upsteam of the catalyst.Your car has 2 sensors, one upstream of the catalyst and one downstreamas you have observed and Jeff pointed out and as shown below. wrote:

liem00 · Answer

Thank you both for the valuable info.Pashlip>

liem00 · Answer

A follow-up question.I ended up buying two universal O2 sensors (#USOS-4000) to replace theexisting ones at this place;see the last one on the list: 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,Liemliem00 wrote:> >

Where's O2 Sensor Bank 1 Sensor 1 for 1997 318is?

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