I have error codes 21 (O2 Sensor Circuit) and 51 (Lean Conditions Detected). I did have 14 too (MAP Sensor), but a new MAP sensor made that code go away. SO doing some research on lean condition I saw people saying things like you could do some serious damge like burning holes in pistons and things. I am assuming I have to replace my downstream O2 sensor and all will be fine. I have driven it probably 200 miles, and about 3 hours on the trails since this started. I know some people lean on their carbs on purpose. I am just curious if I might have done any damage, or how serious of a problem this could be. I am also kinda surprised because I cahanged my O2 sensor about a year ago. When it went bad last time I did not get error code 51, only 21. Any help with this would be great before I go spending more money.
I'M FLEXY AND I KNOW IT
95 YJ, 2.5 AX15 conversion, 4.0 TB, SOA +1.5", 33" DC Crusher Tires, 8.8 Rear w/welded tubes + LSD, Spartan Locker HP30 Front w/solid axle swap, Rocky Road OTT kit, Safari Snorkel, Warn VR8000 Winch, Smittybuilt front Bumper, JKS Disconnects, AA SYE, Teraflex Shock Bar in Rear, 1/2" Boomerang Shackles, RE Add a Leafs, Homebrew Traction Bar, Monstalined in&out, LED Tail lights, 1700 Watt Stereo