2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
My Baby, 99 SLT 5.9 4x4 1500 threw the code p0138....Basicly rear oxygen sensor high voltage. After searching the forum i found a few old threads dealing with either cleaning it or preferable replaceing with a mopar or similar sensor. 2nd time its thrown it in the past week and i have cleared it both times.
1. Will running for a week with this damage anything?
2. What EXACTLY does this mean.....high voltage to a sensor doesnt really mean anything to me?
3. Affect gas mileage....not that it matters with these babies
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you can try taking the aft o2 sensor out and cleaning it really good... becarefull though... they are delicate..just wipe it down and maybe spray it with some carb cleaner... LIGHTLEY spray it and wipe it down and let it airdry overnight.... make sure its screwed back in nice and snug and hook it make up..also make sure the plug is clean too..on both ends... make sure theres no dust... but with that code it prolyl means you need a new one... too high voltage.. prolly shorted out or malfuntioned... when i went to change mine out .. it cost me 120 bux for a brand new mopar one... reason being is that if you get the universal ones..they tend to not work right and throw codes and **** you off... i hate seeing my CEL on... if you clean your original one.. itll help to blow it out with some compressed air..also if you put the new one in and see if the CEL comes back on...if it doesnt..throw the old one back in and see if it comes back... good way to make sure you spent 120 or so bones good...
thanx, i dug up a old troubleshooting book and it said the exact same thing you guys did. so i think ill just replace it this weekend....i assume i have to go through a dealership to get a mopar sensor?
Mine threw the same code, I took it out and used Carb cleaner and a toothbrush to clean it (inside the grooves were carboned up), that was 15,000 miles ago, not saying you will get that much outta yours, but it can keep the 60.00 in your pocket longer
Flip every women upside down and they are all sisters, only difference is "if" you can flip them upside down.
1999 Dodge Ram Sport 4x4 5.9
52 MM TB
Double roller timing
Bilstein HD shocks
Mopar air intake