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[mcdonaldroadcapt]

What are the signs of a failing oxygen censor? My rear cylinder spark plug is very rich and idle is rough. Can tell it is rear due to real dual exhaust. Any help? Thanks.

[Steve Cole]

If you have an aftermarket exhaust the issue can come from that. If it's stock then I would look for a leak and if there is none then it would be time to replace the sensor. The aftermarket in general does a pi$$ poor job of putting O2 sensor into there pipes correctly and V&H are the worst of the bunch.

[HOGMIKE]

codes of P0152 or P0132?

on a related note, what is the life expectancy of these sensors?

 

[mcdonaldroadcapt]

The bike is question is a 2008 FLHTCUSE3 that I have had since new. It runs Kuryakyn headers hooked to the stock Screaming
Eagle mufflers that have performed great for years. This combo has been on my bike for years. This rough idle and rich rear plug reading has just started. I have not seen a check engine light if it would apply. Just hate to take to Harley and get ripped for a look and see.

[porthole]

The aftermarket in general does a pi$$ poor job of putting O2 sensor into there pipes correctly and V&H are the worst of the bunch.

Worse then D&D?

[ozrider]

If it's not throwing any codes then it may not be a sensor.

Have you checked the plug itself, and or the HT lead ?

It might not be running rich, it may be that the fuel supplied is not being  completely burnt.

If the plug and lead checks out OK, then it's time to check maybe for a stuck open injector.

If it still leads you to suspect the O2 sensor, then the easiest way to confirm that is to simply change it out and see if the problem is solved.

[mcdonaldroadcapt]

I changed out the rear sparkplug.  No change. I unplugged the rear sensor and there is no difference in the cold idle.  Once the engine warms up the rough idle starts plus it has an intermitten spitting sound coming from the rear cylinder exhaust exit. However, seems to run fine at highway speeds. Think it maybe the sensor?

[Steve Cole]

O2 sensors on HD bikes will not always set the check engine light but will set a code. Take it to someone who can check it for stored codes.

[mcdonaldroadcapt]

That is what I am going to do prior to spending guess money. Thanks.

[Buckeye_Tuning]

Worse then D&D?

Hard to believe, but yes.

[tweeter13]

What tuner are you running if any,  if you are running one that don't let it go into close loop it may not set a code because the ECM is not looking at o2 sensors for fuel.  Because its not in closed loop.   It may need to have a scanner put on it so someone can actually look at what the ECM is reading.  If there is another sensor that is not reading correctly but is within is specs that it won't turn on a check engine light yet. Or if a o2 sensor is working slowly its with in spec but don't stay out of spec long enough to set a code.  It fluctuates between rich and lean telling the injector how much to inject depending on the parameters you have set up during the tuning process.  It does get a lot deeper than this of coarse but buy hooking up to a scanner can tell you a lot as long as the person using it know what they are looking at and know what things should be.  There are a lot of people on here that know a lot and are on here all the time.  Once they find out what tuner you are using that may help as well.    Todd

[HOGMIKE]

O2 sensors on HD bikes will not always set the check engine light but will set a code. Take it to someone who can check it for stored codes.

That's where I found the codes using Datamaster.

Cleared them, went riding again after new plugs installed, no more trouble codes (yet).
Can't see spending $100 on sensors if they are still working.
I can see them switching on and off from the software after the engine warms up a bit.
I'm thinking they may have been stored codes from some time ago.
Bike is running perfect..........so........"don't fix something that ain't broken" right?
 

[tweeter13]

If I thought I would use it enough I would buy a scan tool for a harley but I have a OTC genesis already updated to 2010. And spent 2500.00 bucks on that.  From what I see for the harley alone I think is double that just to do all the models up to date.  Don't see any profit in that for me.  I don't work on Harley's except my own stuff.  And minor stuff for friends that can't even change oil themselves or just to lazy to.  But they by the beverages.  We be cool just to have. If some one knows where to find them let me know. 

[Twolanerider]

If I thought I would use it enough I would buy a scan tool for a harley but I have a OTC genesis already updated to 2010. And spent 2500.00 bucks on that.  From what I see for the harley alone I think is double that just to do all the models up to date.  Don't see any profit in that for me.  I don't work on Harley's except my own stuff.  And minor stuff for friends that can't even change oil themselves or just to lazy to.  But they by the beverages.  We be cool just to have. If some one knows where to find them let me know.  

There's an alternative much cheaper than $2500.  And it's a good little tool for a small shop or a guy who works on his one and maybe a few buddy's bikes.  Check out the Dayton Twin Scan II tool.  Have seen the older version of this on eBay in the last few months for $200-225.  The new version have seen for $360 or so.  The difference between the two is the new version allows you to bleed ABS brakes.  

[tweeter13]

Thanks will check that out just to be able to bleed brakes would be nice that there is 3 of us now that have abs brakes.