Cadillac Catera and Cimarron Forum Discussion, 2001 Catera throttle body and O2 sensors in Past Cadillac Vehicle Discussion; The new sensor is a direct fit and per rockauto.com, these are compatible and also fits perfectly. This is new ...
The new sensor is a direct fit and per rockauto.com, these are compatible and also fits perfectly. This is new brand and have sold a few of these sensors in the past year and had no problems. The voltage shows 12vdc at the connector end when I turn on the battery. I believe it's the resistance that shows 8.5 on the the old ones and the new one I got shows about 13.
The P0161 was there before changing the sensor, so got the new sensor and now I get codes P0161 and P0140 after the replacement. i swappd the sides and still get the same codes.
I'm going to try one more thing, going to install the old sensor back, clear the codes and test drive it. If the CEL comes on I'll scan it and see what it shows. If it's just P0161 then I'll return APWI brand sensor and go with Bosch or AC Delco brand sensor.
So, with 3 different sensors in bank 2 sensor 2, one of them being new, you always get code 161. I would say there is probably something else wrong. From the connector toward the ECM, or an exhaust leak upstream or the air distribution system. (from the service manual)
There are more tests you can do. There is a detailed troublshooting guide in the manual for all the codes.
For code 161 I'm summarizing from the manual.
Key off for at least 20 min. meter on ohms, red led to pin 3, black led to chassis ground. should be less than 5 ohms.
Key on, meter on VDC, red led to pin 1, black led to pin 2, should be 0 vdc
Start engine, meter on VDC, red led to pin 1, black led to pin 2, should be 12vdc or switching between 0 and 12v.
Engine off, jumper a wire from pin 4 to chassis ground. Key on, Engine off, scantool should read 0 volts (or 0% I would imagine) for the affected sensor.
Also, on the sensors, read the ohms between pins 1&2(the heater) then 3&4(the sensor), and compare them between the sensors.
Okay, thanks. I swapped the new sensor out and installed the old one back. Now both are the old sensors on the car. I check the resistance again on the old sensors and it was 8.3 to 8.5, the new one was 13.3.
I scanned it with live data check and it was reading same numbers at both sensors so pretty sure both sensors are okay. Also, checked the connectors and getting 12vdc.
Okay, here's the latest after installing the old sensor to the driver's side cat. The CEL came on so scanned and it shows P0140 and P0141, no more P0161 so now I think it's the O2 sensor and maybe P0161 was showing because of the new aftermarket O2 Sensor.
The new AC Delco sensor is here and checked the resistance at the two white wires before installing it and I'm getting the same numbers like the old one (8.5). I couldn't get any reading from the gray and black wire on the sensor, similar to the old one.
Well, going to install it in a few minutes and see what it does. if I have anything new I'll be back with the update.
Here's the latest, installed the sensor last night and drove it around all day today and the CEL came on. I scanned it this evening and it's only showing P0140. The P0141 is no longer showing and car is still idling a little rough.
Any idea what to do next? My only guess is ECM and throttle body now.