Code 21

[cndoliver]

I have a 97 JGC 5.2 116000 MILES THE ENGINE STARTED SPUTTERING AND DIED THEN THE ENGINE LITE CAME ON CHECKED THE CODES AND HAD CODE 21 REPLACED BOTH O2 SENSORS AND HAD THE COMPUTER RESET THE ENGINE IS STILL SPUTTERING AND THE ENGINE LITE IS BACK ON WITH CODE 21 AGAIN ANY HELP WOULD VERY HELPFUL THANKS

[cndoliver]

123

[Cam7]

Since you replaced both sensors check the wirring to make sure there is no breaks or shorts i, it can happen quite often.

[cndoliver]

I was rechecking my codes I have 12 21 21 55 on the computer now It is not even drivable now it is sputtering and cutting out so bad sitting at a light or driving down the road need help thanks for any info

[dksob81]

I had this code come up because of a broken wire.

check the K41 wire (BLACK w/ ORANGE stripe) at the PCM. The wire is on the bottum row first wire in from the right (toward the engine), you will have to disconnect the connector from the PCM, just loosen the 8mm bolt holding it on, and flip the connector over and you should see it.

I was trying to check resistance to this wire to make sure it wasn't broken anywhere, I had to remove the connectorr to get to it, and as soon as I flipped the connector over I seen the wire was broken.

[cndoliver]

also the idle will drop down to almost 0 and with the air tube off it sounds like it is a jet taking off it is trying to suck so much air

[cndoliver]

Well finally cared my jeep to the dealership and it was a wire right at the ac compressor broke and $85 dollars later it finally runs good but the gas mileage has dropped they say putting in new O2 sensors help gas mileage I am begging to wonder