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[fxdsebeloved]

I have been battling a check engine light and my dealer now for about 3 weeks. the check engine light didn't appear until after the "Enhancement" was done.    (I think they may have damaged the rear 02 sensor)  I keep bringing it in and they keep clearing the code and telling me it should be fine.    But the check engine light keeps comming back on with the same codes displayed (PO152 & PO154)  It appears that you can switch the rear sensor with the front sensor so I can see if the code moves to front.  I  don't want to assume that you can.  I am slightly mechanically challenged  

[sadunbar]

I have been battling a check engine light and my dealer now for about 3 weeks. the check engine light didn't appear until after the "Enhancement" was done.    (I think they may have damaged the rear 02 sensor)  I keep bringing it in and they keep clearing the code and telling me it should be fine.    But the check engine light keeps comming back on with the same codes displayed (PO152 & PO154)  It appears that you can switch the rear sensor with the front sensor so I can see if the code moves to front.  I  don't want to assume that you can.  I am slightly mechanically challenged  

You can switch the 02 sensor front to rear...

I gotta ask....which dealer?   

[fxdsebeloved]

You can switch the 02 sensor front to rear...

I gotta ask....which dealer?   

"The world's oldest Harley Dealer" Kegels 
  

[FLYNDYNA]

Tell 'em you've retrieved the code, you are under warranty and they need to fix it...and that it is documented on a site populated by 6,600 Harley enthusiasts that are monitoring your progress with them...

[sadunbar]

"The world's oldest Harley Dealer" Kegels 
  

Which is the closest dealer to my home and I have not stepped thru their doors in about 5 years....   

[fxdsebeloved]

Well the next closest ones would be Woodstock or Kutters.  Woodstock is on my way to work and Kutters is North out of my way

[sadunbar]

Well the next closest ones would be Woodstock or Kutters.  Woodstock is on my way to work and Kutters is North out of my way

Kutters is my dealer of choice - but I have friends who are happy with Woodstock. 

I know of no one who would say anything good about Kegels service department.....   

[lv2ride56]

This started happening to mine right after the enhancement including complete new heads. First with SERT then I switched to TMAX and it has gotten worse until today the check engine light came on and stays on. Both front andrear shows EGO fault which I have cleared in all previous instances only to have the engine light come on in a shorter and shorter time frame.
My dealer also says everything OK and clears the code the times I took it to him.
I'm thinking perhaps the new compression release valves are the problem??? Any ideas.

[fxdsebeloved]

I'm thinking perhaps the new compression release valves are the problem??? [/b] [/i]


 Why would you think the ACR would cause a fault in the O2 Sensor?

[lv2ride56]

[ Why would you think the ACR would cause a fault in the O2 Sensor?
[/quote[/color]]

Because the dealer keeps telling me it is a code for low compression. Codes are 0131 and 0151 for O2 sensor low. Makes no sense to me.

[grc]

[ Why would you think the ACR would cause a fault in the O2 Sensor?
[/quote[/color]]

Because the dealer keeps telling me it is a code for low compression. Codes are 0131 and 0151 for O2 sensor low. Makes no sense to me.

Your dealer is a complete and total moron.  The sensor low codes mean that the sensor voltage is low.  There are also codes for sensor high, which I guess your dealer would claim means you have suddenly increased your compression ratio somehow.  I'll stick with the real meaning, which is the sensor output voltage is high. 

Narrow band O² sensors generate a small voltage (zero to 1.0 volts) to signal the ECM with the relative amount of oxygen in the exhaust.  The target value is .45 volts, which corresponds to the required 14.7:1 air-fuel ratio.  When the ECM gets a signal of less than .45 it adds fuel.  When it then gets a signal over .45 it reduces fuel.  This is an ongoing process whenever the system is running in closed loop mode, and results in a rapidly varying real AFR that is centered about the target value.  If the voltage signal remains below the target for more than the normal amount of time, the ECM sets the sensor low code.  Odds are that the sensor was damaged and is no longer responding to changes in the exhaust gas oxygen level, or there is high resistance between the sensor and the ECM causing the voltage seen at the ECM to remain below .45 volts. 

Jerry

[lv2ride56]

Jerry, thanks for the knowledgeable input. Can you relate what, if any, difference there would be when running the wide band O2 sensors such as the Zippers Thundermax with auto tune?
Thanks again for your input and I certainly don't disagree, at this point, with your assessment of my dealer.

[grc]

There are many differences in narrow versus wide band sensors, one of which is that the wide band sensors are more precise and can read a wider range of AFR's directly.  The narrow band sensor systems basically switch constantly from rich to lean to rich indications (they just indicate either rich or lean relative to the target, but not how much too rich or too lean), the wide band sensors with the appropriate controller can can lock in on a steady AFR, resulting in less switching by the ECM.  In terms of the diagnostic code, it doesn't really matter which type sensor you're running, the code means the same thing.  A low voltage indicates lean, and if the system cannot quickly correct that condition by adding fuel it sets a code. 

Jerry

[fxdsebeloved]

Not knowing what year you bike is the codes are a little differant on the 07 models vs 2008 models

link for 07
http://www.hdtalking.com/diagnostics_and_fuel_injection_related/728-04_07_hd_dtc_codes_and_activation.html

link for 08
http://www.cyclespot.com/forums/showthread.php?t=14930