| Author | Message | ||
     Bill Hart Experienced User Username: bill_hart Post Number: 39 Registered: 6-2015 |
Sorry to say that none of the posted procedures would query the Motronic on my '95 Bentley. Contacted a dealer from whom I have occasionally bought parts and he kindly sent me the query procedure for the K Motronic 3.3, which is fitted to only the '94 and '95 models. Blinks "1221" - Heated Oxygen Sensor. What do I have to do? | ||
| michael vass Experienced User Username: mikebentleyturbo2 Post Number: 48 Registered: 7-2015 |
Hi Bill My last post has dissappeared again , whats wrong with this forum? Have you changed the lambda sensor? Does it clear after a good run? Hope this helps Mike | ||
| Bill Hart Experienced User Username: bill_hart Post Number: 40 Registered: 6-2015 |
Hi Mike, Haven't changed it yet. Looks like it may be a DIY job, sort of like changing a spark plug, depending on accessibility. Can you, or someone, tell me where it's located and whether accessible from above or underneath the car? | ||
| Robert Noel Reddington Grand Master Username: bob_uk Post Number: 640 Registered: 5-2015 |
The oxygen sensor looks a bit like a spark plug even the thread is the same 18mm. They are fitted before the cat as close as possible to the engine. To change simply unscrew. Note that some release agents can damage the catalytic convertor. And also note that some anti seize compounds can damage both the new sensor and the catalytic convertor. So read the instructions carefully and obey. Most oxygen sensors are fitted under the car and are intentional fitted with easy access in mind. The oxygen sensor is a long lived device but is still a service item. Many last the life of the car. I read somewhere that the makers suggest a life of 50k miles before replacement to be on the safe side. If the oxygen sensor fails then damage to the engine WON'T happen. So most leave until broken. How they work. The heater is for fast warm up from cold. The first sensors had no heater and had 1 or 2 wires. Modern heater types will have 3 or 4 wires. The 3 wire is earthed via the body. The 4 wire one uses the 4 wire as earth for the heater. The actual sensor bit is separate electrically. It has 2 wires. The sensor produces a voltage in the presence of exhaust gas. One side of the sensor is open to the outside air and oxygen. The voltage varies between 0.2v weak and 0.8v rich. At the extremes the sensor isn't very accurate. This causes the ECU to continually adjust mixtures. The optimum volts is 0.45v the ECU tends to over shoot. To test an oxygen sensor start engine and measure voltage the volts should climb and fall continually. | ||
| David Gore Moderator Username: david_gore Post Number: 1764 Registered: 4-2003 |
Michael, As far as I am aware, your post never appeared possibly because you didn't complete the posting process beyond the preview stage. Even I have suffered from this indignity from time to time especially when side-tracked by other more immediate demands on my time. I certainly have not deleted your post as the only posts deleted by me in recent times have been duplicates and I doubt if our Administrator has intervened. | ||
| michael vass Experienced User Username: mikebentleyturbo2 Post Number: 49 Registered: 7-2015 |
Cheers David It's frustrating when you spend time thinking and sorting a reply and when I look back, nothing , don't know why ,must be my age lol. Thanks Mike | ||
| Christian S. Hansen Frequent User Username: enquiring_mind Post Number: 75 Registered: 4-2015 |
Michael and David... You fellows have no monopoly on "incomplete posting" syndrome. I am to the point where I make a temporary copy of each posting prior to hitting the "post message" button. After a few times composing a message, closing the window, and later realizing that I made a mistake and it did not actually post, and being annoyed at myself (the neighbors, constantly hearing me shouting "Christian, you idiot" probably think I live with someone also named "Christian"), now I simply verify each posting immediately and if it did not go thru, copy and paste from my back-up copy before deleting the copy. I have been so spaced recently that perhaps every other posting, that backup copy comes in handy. Works for me! Keeps that other fellow out of trouble, too. | ||
| michael vass Experienced User Username: mikebentleyturbo2 Post Number: 50 Registered: 7-2015 |
Haha nice one Christian , nice to know I'm not alone, or him lol Mike |
