E36 OBD1 O2 Sensor Failures

[Triodeotl]

Hello,

I have a 1994 325is e36 with OBD1. In the past 40 thousand miles the o2 sensor has been replaced about 10 times. Always turning on the CEL light. Relay checked. MAS checked. Plugs replaced. Not sure what is happening. Put a Desno O2 sensor in at one point and it went 10 thousand miles. When that one went out this summer I put another one in. now 6 months later CEL is on and O2 is again out.

Car is 5 speed manual. Yes there are different part #'s for O2 sensors for manual and automatic depending on the manufacturer.

What causes these to burn out. I replaced the ECU at one point. Car only has about 95 thousand miles. This started at the normal O2 interval at 60 thousand miles and has been a problem ever since.

Do I have a bad CAT? Can I put one of those spark plug non foulers in the CAT to move the O2 sensor out a little farther so it does not get so hot?

Anyone have any ideas. Has anyone had this happen to their OBD1 E36 and what was or is the cure.

Thank you!