This is on my 2003 Disco II with 85k on it. My my engine has been running rough ever since I did the head gasket job a few months ago (I also changed the timing chain, cogs, oil pump, Thermostat to the cooler running one, and water pump). New coil packs with magnacore 8.5 (Red Color) and Bosch x4 Plugs. No check engine light for months, but engine shake while idling.

So I decided to replace my front/upstream O2 sensors with Bosch O2's (Part# 15175). Cleaned connections, started her up and the engine shake is WAY worse.

I threw 3 codes after I switched the O2's which include

P0150
P0126
P1590

Ordered the replacement plugs for the downstream O2's which I chose to go with the NTK's (OEM O2s) to see if that helps. Any help would be appreciated!

 

Is that P1590 or P1509 (Idle Speed Control Short Circuit Fault)?
http://www.wikihow.com/Check-an-Idle-Air-Control-Valve

 

Its a P1590, which makes sense because I replaced my upper and lower ball joints a months back and ever since my Traction Control will kick in when I hit 1200 RPMs, so I disconnected the front wheel speed sensors and haven't had the problem since. Other than a christmas tree of lights on the dash lol (ABS, E-Brake, ABS, Hill Decent)

 

One O2 related.
......

 

Does the P0150 code represent the Upstream O2's? Which side?

 

I also unplugged the battery today for almost an hour to clear the codes. Checked my coolant, level was right at the (Cold Level) mark, so decided to top it off to the brim. Reconnected everything after an hour and SES light is off. Drove it around for a bit and nothing. Turned it off and back on, and still no SES light.... Fingers crossed

 

I'd assume so, that's "ed from manual but fortunately have yet to need the info on mine.
......

 

Is "RH" Driver or Passenger? Plus, since unplugging the battery for an hour, I've yet to throw a SES light, hoping for the best! The downstream O2 sensors come in on Monday

 

......