O2 Sensor Inline Enrichment Device
(O2 IED)
Patent Pending

Fits all 2007/2008 Harley-Davidson® with O2 sensors

A ‘plug-n-play’ upgrade designed to let the engine equipped with OEM oxygen sensors run at a richer 14.2:1 air fuel ratio in closed loop mode. The improved air fuel mixture has generally shown one of more of the following positive results: 

·          lower engine temperature

·          decreased exhaust heat

·          improved throttle response

·          less engine ‘ping’

Installation Instructions

·          Locate Front/Rear O2 sensors

·          Follow wiring 6-8” to black connector

o         Front Connector may be located behind a plastic panel

o         Remove the seat for rear sensor on Dyna

o         Cut any tie wraps holding the connectors in place

·          Unplug weather-tight connector

·          Plug the IED between O2 sensor and wiring harness

·          Make sure the connectors lock into each other

·          Tie wrap the IED in place to prevent it from hitting the exhaust system

Installation is complete and your motorcycle is ready to ride.

Testing the NBO2 Inline Enrichment Device off and on the bike

If at any time you think your O2 IED is not working properly, you should first make sure the connectors are properly plugged in and are tight. If you still feel there is an issue, you need to remove it from the bike first. Test your O2 IED with a 1.5V battery, 2 paper clips and a volt meter. First you need to check the battery to make sure it is producing 1.5V. Open up the paper clips and install them into the female connector (wiring harness side). Touch the battery to the paper clips so the (+) side is on the blue wire site and the (-) on the grey side. Touch the voltmeter to the male connectors (wiring harness side). You should see 1.00 to .90 volts or about 30% less than the battery voltage. If the correct voltage is present, the O2 IED is working correctly.

You can also check your O2 IED on the bike. Disconnect the O2 IED at the wiring harness connector. Your O2 IED will still be connected to the oxygen sensor. Start the engine up, letting it warm up for 2-3 minutes. With a voltmeter connected to the two pins in the connector, check the voltage. Normal voltage should be .250 to .750 volts with the engine running. If there is no voltage at the O2 IED pins, disconnect the O2 IED from the oxygen sensor. Check the voltage at the sensor pins. Normal voltage should be .250 to .750 volts. If there is no voltage at the oxygen sensor, the oxygen sensor is bad. If there is voltage at the oxygen sensor, but not at the O2 IED, then the O2 IED needs replacement.

These devices may not be legal for street use on pollution controlled vehicles. Check local laws and regulations to ensure compliance.
SPMULLEN LLC warrants Nightrider.com Performance Products against defects in factory workmanship and material for 30 days from the date of purchase with proof of purchase or until ownership in the part is transferred. The manufacturer and seller make no warranties express or implied which extend beyond the description of the goods contained herein. Any description of this product is for the purpose of identifying it and shall not be deemed to create an express warranty. SPMULLEN LLC shall not be responsible for any consequential, special or incidental damages of any nature, including but not limited to the loss of use of any vehicle on which the unit may be installed and the cost of obtaining substitute components.
Harley-Davidson is a registered trademark of Harley-Davidson, Inc. Model designations for Harley-Davidson Motorcycles are used for reference purposes only. This part is not manufactured or endorsed by Harley-Davidson


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Getting 131/151 Codes?
-Parts listed on this site that alter fuel mixtures or replace OEM pollution control devices are for Race Only Purposes. Check with local regulations and laws to ensure compliance. In California, Race Only products must not be used on any vehicle that is registered or licensed for use on public roads.
- References to Harley-Davidson and H-D makes, models and other trademarks are for reference purposes only and do not constitute affiliation or endorsement by Harley-Davidson Inc.
-Air Fuel Ratio's (AFR) represented for these products are based on exhaust gas temperatures (EGT) of 1400-1500 F. Cooler EGT during startup, cooler weather or during some dyno testing with cooling fans can result in .5 to .8 leaner AFR's. This is normal due to the way unheated narrow band O2 sensors react to changing EGT's. The "hotter" the engine gets, the better the IED's actually work.
General Terms and Conditions:
All Pricing are in US Dollars. Shipping is extra unless noted. Selling Price is listed on catalog WEB page. Incorrect Billing prices will be corrected and re-invoiced.
All Shipping Costs listed are for USA delivery unless otherwise noted. International Shipping Costs, when applicable, will be invoiced via e-mail prior to shipping.
Returns will only be accepted on unopened products. Returns may be subject to 20% restocking fees. No refunds on shipping costs.
All Warranties will be handled by the actual Manufacturer.

Nightrider Performance Parts is a Service Mark for S&P Mullen Enterprises, Inc.
Copyright 2007-2010 PG Mullen, S&P Mullen Enterprises, Inc., 313-444-XIED(9433) , Oldsmar, FL 34677