Rear O2 codes, bad sensor?
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Cruiser
Joined: May 2013
Posts: 110
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From: Minnesota
Rear O2 codes, bad sensor?
Good evening ladies and gents. I picked up a Pro Pipe for my Slim last weekend and got it installed Saturday, took it for a rip and it sounded great! Just what I was looking for, enough sound to be heard but my neighbors don't seem to mind the extra growl. It seems to be opened up a bit too, it seems like it doesn't take as much throttle to get to speed as it did with the stock pipes. Very happy so far!
I noticed the CEL while on my little cruise, so I pulled the codes with my FP3 when I got back (also happy with the FP3, very easy to use) and it was throwing a rear O2 heater low/open and a rear O2 sensor high/open. I double checked and got the right O2 sensors in the right holes (front is in front, back is in back) and made sure it was pushed in all the way. I didn't get to ride it until today again so I cleared the codes and went for another little rip. I should note that I tried to clear the codes, the rear O2 high/open cleared but the rear O2 heater low/open didn't.
I'm taking this to mean that I damaged the voltage or ground wire in the O2 sensor when I was installing it in the new pipes, which is why its throwing a heater code and a signal code from the O2 sensor. Does this make sense? I figured if I had an exhaust leak and the sensor wires were fine it would just throw the signal code, not the heater one as well. I just wanted to make sure before I bought a new one and ripped the damned exhaust off again.
Thanks all!
I noticed the CEL while on my little cruise, so I pulled the codes with my FP3 when I got back (also happy with the FP3, very easy to use) and it was throwing a rear O2 heater low/open and a rear O2 sensor high/open. I double checked and got the right O2 sensors in the right holes (front is in front, back is in back) and made sure it was pushed in all the way. I didn't get to ride it until today again so I cleared the codes and went for another little rip. I should note that I tried to clear the codes, the rear O2 high/open cleared but the rear O2 heater low/open didn't.
I'm taking this to mean that I damaged the voltage or ground wire in the O2 sensor when I was installing it in the new pipes, which is why its throwing a heater code and a signal code from the O2 sensor. Does this make sense? I figured if I had an exhaust leak and the sensor wires were fine it would just throw the signal code, not the heater one as well. I just wanted to make sure before I bought a new one and ripped the damned exhaust off again.
Thanks all!
Outstanding HDF Member
Joined: Apr 2010
Posts: 2,477
Likes: 14
From: Western MD
Before you replace the sensor, check the harness side of the connector. one terminal should have 12 volts on it with the ign and run on. as long as that's good, look in connectors and make sure the male pin connector doesn't have any terminals bent over or mis-aligned. also check you didn't somehow pinch or cut any of the wiring, both the sensor wiring and the harness wiring where you would have been working with.
Club Member
Joined: Jan 2007
Posts: 3,550
Likes: 1,928
From: NE Florida
I got the same code when I swapped out my exhaust recently. But, I replaced the rear sensor because when I pulled off the factory exhaust, the sensor plug got caught so the wires got yanked. I figure I messed it up so I replaced it. Cleared the code after the install and it never came back.
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