964enthus

Hi
over the last 8 years ,my CO readings at the MOT have always been extremely low :0.01,0.008,0.005...up to 0.132 last year
This year ,reading was 4 !!!
As it happens ,i had disconnected /reconnected the o2 sensor plug to take the cat out when i did my cam covers
Main culprit seems to be a poor connection
I have rechecked it and It looks ok
Is there a way of checking now if the O" sensor is working or should i go to the MOt place and have another test done ?
Could there be someyhing more sinister behind this (vast) increase ?
Other question ,if i have driven the car for a few hundred miles with the O2 sensor not connected (hence to rich a mix) could this have damaged the cat for ever ?
As always ,i would be grateful for your views and ecperiences
Peter

crg53

I am copying this out of Adrians book. Hope this helps.

964enthus

F A N T A S T I C !!!
many thanks indeed
Peter

RW964

Wow this is a nice pc information to have, going to bookmark this also I have random notes such as this I print out and put in a folder I have in the trunk so if out in the country or someplace and I need it I can maybe find what I am looking for and have pictures also procedures on how to check things out.. Ya never know ... I had some work done on my car a bit ago and the indee said the O2 sensor was slow and that was it for the price of a cat and engine work it will be worth it just to get a new one..... Thanks again for the information .. Good PPL on here .. Thumbs up to 53

uli1266

You can find even more useful information in the workshop manual, it's available here:

https://early911nzdownloads.yolasite...op-manuals.php

RW964

After looking at my O2 sensor I found it did not match the print above ...on pin 2 I have 12 volts engine side this is coming from a 15 amp fuse also shown in the print provided .. it also shows pin 3 on the sensor side to be Sensor itself as it has a shielded wire going from it to the DME ....