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Car Forum / Volvo Cars / September 2007Who has cheap 740 O2 sensor?
Its for my 92 740 turbo wagon. After changing the air mass meter, the gas mileage went up to normal for a couple of weeks, and then plummeted again. Needs another new part. Rock Auto has a Bosch sensor for $99. But I seem to remember a few months ago someone in this forum told me of a source for one that is only around $ 60. The car is setting a code for "adaptive lambda either too rich or too lean at part load". It is 3-wire , heated type. > Its for my 92 740 turbo wagon. After changing the air mass meter, the > gas mileage went up to normal for a couple of weeks, and then [quoted text clipped - 3 lines] > setting a code for "adaptive lambda either too rich or too lean at > part load". It is 3-wire , heated type. There are "universal" sensors sold for around $60 which require splicing instead of being a direct plug in. I've not had the best of luck with those splices and would spend the extra $40 (about one tank of fuel!) to get a direct connect type. Part of my job as an avionics tech is making high-reliablility splices, so I have no qualms about tackling automotive splices. Its the mechanic stuff I am often not so hot with ;-) Regards, Geronimo. >> Its for my 92 740 turbo wagon. After changing the air mass meter, the >> gas mileage went up to normal for a couple of weeks, and then [quoted text clipped - 8 lines] >those splices and would spend the extra $40 (about one tank of fuel!) to >get a direct connect type. > Its for my 92 740 turbo wagon. After changing the air mass meter, the > gas mileage went up to normal for a couple of weeks, and then [quoted text clipped - 3 lines] > setting a code for "adaptive lambda either too rich or too lean at > part load". It is 3-wire , heated type. Test your lambda first, because the most certain is that the problem should be elsewhere. You need a multimeter and a gas flame and some instructions that you can find in the web, like I did some years ago. Yea, I probably should look at the connector first...its is in such a high-heat area, and the car is so old.....still the O2 sensor has probably not been changed well in excess of 60K miles, I suspect. I was looking at a NTK brand universal replacement. THe salesman on the i-net whom I chatted with said it is not a good idea to get a universal (no connector) as I will "never get a good enough connection, and the reading will be inaccurate". What does teh average mechanic do? Crimp a plain butt splice on? He may be right...but it depends on how long the wires are a lot, the splices will get hot as an oven if the wires are only a few inches long! Possibly it would get so hot with the splices near the sensor that even a normally high reliability splice like a solder-splice with (high-temp fusion wrap) would melt or weaken. I can pay $65 for a NTK universal, or for *$100 MORE* get the very same thing with a connector! Thats' insane. >> Its for my 92 740 turbo wagon. After changing the air mass meter, the >> gas mileage went up to normal for a couple of weeks, and then [quoted text clipped - 9 lines] >You need a multimeter and a gas flame and some instructions >that you can find in the web, like I did some years ago.
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