6.7L Cummins Forum

I had a couple of codes come up that necessitated testing the 02 sensors and here's how it's done.

Disconnect the Oxygen Sensor harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure resistance of the 02 sensor heater between the (K99) 02 heater supply and (K79) 02 heater return circuits.

Is the resistance 3.2 +/- 0.8 ohms at ambient temperature?

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10

Soooo, I guess you know

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7.5 3500QC 6.7CTD 68RFE Build date June 2007
Superchips tuner 3808, Boost/EGT Laser Gauge, Airaid cold intake

Well it would be nice if there was a way to check the 02 sensor module other then replacing it but I'm pretty confident since I'm getting a code for both 02 circuits that this will fix it. If it does I'm going to take the cover off the module to have a look see, should be interesting.

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10