rjhat Posted February 6, 2004 Report Share Posted February 6, 2004 I am late getting my tag for my caddy because of code P0140- 02 sensor no activity. I was told that it was bank 1 sensor 2. Also, doesn't a bad O2 sensor give incorrect readings? No activity sounds like a connection problem or wiring problem. Do they just quit? This car has to pass emissions before I can renew my tag, and simply reseting the pcm codes just causes it to fail emissions with "computer not ready to report on emissions" on state emissions computer. Can anyone give more info as to which sensor bank 1 sensor 2 is? Link to comment Share on other sites More sharing options...
Ranger Posted February 6, 2004 Report Share Posted February 6, 2004 I am at work so I am going from memory here but I believe bank 1 is the right bank (firewall side). Sensor 1 is on the manifold, senor 2 is pre cat, sensor 3 is aft cat, bank 1 sensor 1 is on the left bank manifold. Link to comment Share on other sites More sharing options...
rjhat Posted February 7, 2004 Author Report Share Posted February 7, 2004 Thanks Larry, i'm going to try to change it tomorrow. If I understand you correctly, Bank 1 sensor 2 will be on the firewall side of the exhaust just before the catalytic converter? Again, thanks for the help! Link to comment Share on other sites More sharing options...
ROCKnROLL Posted February 7, 2004 Report Share Posted February 7, 2004 Larry's memory is just fine! DTC P0140 HO2S Insufficient Activity Bank1 Sensor2 is indeed the pre-converter oxygen sensor. Link to comment Share on other sites More sharing options...
rjhat Posted February 7, 2004 Author Report Share Posted February 7, 2004 Thanks guys! Maybe I will get this thing fixed tomorrow and state of GA wont get on my back! I suppose that most aftermarket brands will do? If anyone thinks different, let me know. Otherwise, its off to the local autozone in the morning! Link to comment Share on other sites More sharing options...
KevinW Posted February 7, 2004 Report Share Posted February 7, 2004 Thanks guys! Maybe I will get this thing fixed tomorrow and state of GA wont get on my back! I suppose that most aftermarket brands will do? If anyone thinks different, let me know. Otherwise, its off to the local autozone in the morning! A narrow band oxygen sensor is responsive across a relatively narrow air-fuel range. Basically, it reports if the air-fuel ratio is richer or leaner than 14.7:1. As the sensor ages or gets contaminated, it becomes less sensitive. One of the functions of OBDII is to monitor the response rate of the oxygen sensors after a given warm-up period. I would buy a Delco sensor, as it is uncertain that the characteristics of an aftermarket part are compatible with the PCM's diagnostic thresholds. ___________________________________________________ Link to comment Share on other sites More sharing options...
Ranger Posted February 7, 2004 Report Share Posted February 7, 2004 Thanks guys! Maybe I will get this thing fixed tomorrow and state of GA wont get on my back! I suppose that most aftermarket brands will do? If anyone thinks different, let me know. Otherwise, its off to the local autozone in the morning! Based on Bill's recomendations I would second sticking with Delco on this one. Nothing worse than doing the same job twice. Link to comment Share on other sites More sharing options...
rjhat Posted February 7, 2004 Author Report Share Posted February 7, 2004 Understood, think I will take the advice and stick to delco parts. Installation seems pretty straight foward. Thanks alot! I'll let you know how it goes. Link to comment Share on other sites More sharing options...
rjhat Posted February 7, 2004 Author Report Share Posted February 7, 2004 Does this require changing both sensors before and after the catalytic converter? Every ad I see says "requires 2 sensors" Link to comment Share on other sites More sharing options...
Ranger Posted February 7, 2004 Report Share Posted February 7, 2004 I would just change the ones that are tripping DTC codes. Link to comment Share on other sites More sharing options...
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