Test TC-13A - Right O2S Stays Below Center (Lean)

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

NOTE: BR body (heavy duty engine) is equipped with dual O2S. Scan tool displays dual O2S as LT O2S and RT O2S.

Start engine. Allow engine to run until normal operating temperature is reached. Using scan tool, set engine speed to 1500 RPM. Go to next step.
Using scan tool, read RT O2S voltage. Snap throttle open several times while monitoring scan tool. If RT O2S voltage is not always less than 0.5 volt, condition required to set trouble code is not present at this time. Go to next step. If voltage is always less than 0.5 volt, go to step 4).
RIGHT O2S STAYS BELOW CENTER (LEAN) trouble code sets if RT O2S output voltage stays less than 0.5 volt without switching for more than 8 minutes. Possible causes are: large vacuum leak, low fuel pressure, other engine sensor calibration failures, ignition system failure, O2S failure or mechanical engine problem. Go to TEST NTC-1A.
If LEFT O2S STAYS BELOW CENTER (LEAN) message is not also set, a possible cause could be a shorted injector control circuit or a restricted injector. Go to TEST NTC-1A. If LEFT O2S STAYS BELOW CENTER (LEAN) trouble code is also set, a condition causing engine to run lean in all cylinders is indicated. Go to TEST NTC-1A.