I changed all 4 O2 sensors and I now have a diag of P1187? Any ideas

 

P1187
Land Rover
HO2S Heater Short Circuit, Upstream Sensors


Where did you get your sensors?

 

from sparkplugs.com at $70 a piece

 

So, you have a bad 02 sensor, what brand did you instal, have you rechecked the connection?
I would suggest you call the supplier and see how he wants to handle the warranty replacement.

 

OK........so how do I know which one it is?

 

One of the one's in front of the cats.

Did you wire these in yourself or did they have connectors on them?

 

So answer my question, where did you buy them and what brand are they??????????????????

 

I stated above that I bought them on line at sparkplugs.com................
I bought 4 NGK OE identical sensors. They came with connectors on them which just snapped on.............

 

Double check all of you connectors to make sure they are mated right. If they are good, one of them is bad. Your sensors have pre-heaters in them and one is not working...

 

Could we have an electrical problem that is causing this. The guy before me had similar problems and apparently replaced sensors before and couldn't get OBD to clear. I will check to make sure connections are mated up correctly but I did already check to see if they were connected and they were tight.