Nightrider Technical Notes
Technical Support
HD CE Codes
Posted by Administrator on 10/3/2013
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2007 and Later Harley-Davidson Engine Performance
Posted by Stephen P Mullen on 10/1/2009
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131/151 Explained
Posted by Stephen P Mullen on 10/1/2009
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What do the 131/151 codes mean?
The codes are specifically listed as P0131 and P0151 codes. The description in
the Service Manual is:
P0131 Front O2 sensor low or engine running lean
P0151 Rear O2 sensor low or engine running lean
The key point to look at here is "O2 sensor low" when analyzing what
is happening with the XIED's in place.
Nightrider closed loop ECM products
Posted by Stephen P Mullen on 1/1/2008
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2007 HD High Heat Behavior
Posted by Stephen P Mullen on 1/1/2007
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2007 and Later HD Performance Upgrades
Posted by SP Mullen on 1/1/2007
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