I keep getting a check engine light. I have had the O2 sensor replaced three times and within 30 miles the check engine light is back on. I bought an OBD II scanner and the reading is always P133 which is the same O2 sensor. Has anyone had the same problem? I keep using my scanner to turn off the check engine light, but within 30 miles it is on again.

Any suggestions?

 

Oops. Forgot to tell that the car is a 1998 SL600 Sport.