Recently changed a HO2 sensor left bank ( precatalytic ) cause of aging sensor. Runs smooth now but still have diagnostic code 134. Any help out there on this one?

 

What year is your truck, how many miles on it?
P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
Mike

 

Land Rover Discovery Series II with 96000 mi. Thanks for the reply, I think I found the answer. Loose connector since it is so hard to access. Had to use an extension to push the O2 sensor connector. Heard it click. The MIL went out on its own after driving about 2 hours. Hopefully it wont be back. Thanks again. Ed.

 

Hope that works for you and do suggest that as soon as possible you replace the other 3 O2 sensors so they are all balanced in their operation. Where did you buy your o2's from and what did you pay?
Mike

 

Got them from NAPA for about about $59 , not much more, for the precatalyst. Will change the others as you said.
They're alot easier to get to. Thanks, Ed