Test TC-10A - O2S Stays Above Center (Rich) Or Left O2S Stays Above Center (Rich) (DTC 52)

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, 1995 Dodge Dakota, 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.

Start engine. Allow engine to run until normal operating temperature is reached. Using scan tool, set engine speed to 1500 RPM.
With engine speed still set at 1500 RPM, read O2S voltage. If O2S voltage is always more than 0.5 volt, a condition causing engine to run rich is indicated. Perform TEST NTC-1A. If O2S voltage is not always more than 0.5 volt, condition required to set code is not present at this time. Go to next step.
O2S STAYS ABOVE CENTER (RICH) trouble code sets if O2S output voltage stays at more than 0.5 volt, but less than 1.2 volts, for at least 8 minutes. Possible causes are: high fuel pressure, other engine sensor calibration failures, ignition system failure, O2S failure or mechanical engine problem. Perform TEST NTC-1A.