I heard that oxygen sensors '96 or newer are different from pre '96 ones due to the changes with the OBD computer differences.

I've also noticed on the Bosch website that the sensors for the newer cars have a 100,000 interval vs. a 60,000 interval for older ones, I think that # is the miles it's suppose to last.

So what I'm getting at is if I purchase a newer sensor for a car in the year range of 1998 or newer that has a 100,000 interval will it work in my car that's a '92 with a sensor that's has a 60,000 interval. As long as the sensor is a pre-cat and 4-wire like my OEM one it should work, right? Or are their differences since I don't have an OBD II computer.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500

They probably would work but you can never tell whether the appliction requires special heating characteristics. Some sensors are designed to be basically heated by the exhaust others aren't.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Improvements in materials and manufacturing are usually implemented across the board for both older and newer designs which should mean improved service life for sensors currently manufactured for older cars.

Unless you are a qualified emission control system engineer, you should install the O2 sensor called out for your car by the sensor manufacturer and not attempt to adapt another sensor.

O2 sensor life varies widely, and I find no reason to change them at an arbitrary mileage. Some on this board have 10 to 15 year old cars with well over 100K miles and have never changed the sensor!

The sensor is a suspect if the car fails an emission test, and its function may be checked by testing the duty cycle of the EHA and observing the O2 sensor output directly with a scope. Both of these tests have received extensive discussion on this board.

Duke

I was planning on replacing the sensor with the Bosch 13275 which is the sensor used on the 93 Dodge Caravan with the V6.

Several people have have used that one and it seems to work fine. It's just that on ebay there's always several O2 sensors for sale and I figure if I stick with a Bosch I'll be fine, I just want to be sure about all the differences.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500