To anyone who can help me I would be grateful I have 2002 Jeep Cherokee 4.0 unmodified. It just turned $200,000 miles when I'm driving down the road the oil pressure is fine when I let off the gas it falls to zero but only when the computer is in closed loop. I ran a code scan on it and the code come up 0122 and I had an issue with the fan relay but I got that fixed and erase the codes and now that code will not come back up. it still Falls to zero when I let off the gas it just doesn't throw a code when it falls to zero the idiot light on the dash comes on and the Dinger goes off telling me to check the gauges but it doesn't throw a code. Can anyone help me or tell me where to start?

 

Skidbilly, Can you check the O/P sensor to see if it might be leaking, or just go ahead and swap it out?