Guys I have a 1999 discovery 4.0 have twoerror codes that came up after I replaced the four O2 sensors p1316 and p1185 truck runs like crap any ideas?[:@]

 

How many miles are on the truck, what brand o 02 sensor did you use, did it come with a plug or was it a universal 02?
The 1316 is excessive emissions and the 1185 is for upstream oxygen heater problems.
Can you better describe how the engine is running?

 

Mike I purchased the O2 sensors from rovers northand are the plug type which matched the ones I removed. The truck has 130k on it. As part of the bigger picture at the time I replaced the O2 sensors I replaced the Y pipe before I did that I did run sea foam through the truck (mixed in the gas) as per directions on the can. The truck seems to stumble on acceleration through all speeds almost like an electrical miss however the plugs and wires were also replaced with parts from rovers north since they have detailed info on my truck I can only assume that they were the correct ones. Were is the O2 heater that you mention located? Could this be part of the excessive emission issue? Totally at a loss for a next step here.[/align]

 

Each 02 sensor has a heater unit built in. I would suggest you contact where you bought them and tell them what is going on.
Have you checked the plugs, what brand are they, what gap and do they look old, how about the plug wires, are they the old factory grey 7mm wires?

 

Mike been out of town for awhile just got back and want to revist 1999 disco1 4.0 issues what type of plug would you recommend for this engine and can they be purchased locally?New 02 sensors on the way do you have any other thoughts that may be of help in resolving the [>:]

 

I am big on Bosch Platium Plus 4 plugs and 8 mm Magnacor plug wires, the combination makes for a nice improvement in overall performance.

 

I would recommend factory land rover parts,even plugs,sounds stupid I know but these engines run best on factory parts