Test TC-13A - Left O2S Stays Above Center (Rich) (DTC 52)

WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For circuit & connector terminal identification, see CONNECTOR IDENTIFICATION DIRECTORY . For wiring diagrams, see WIRING DIAGRAMS section. After each repair, perform TEST VER-2 .

NOTE: DRB displays left oxygen (O2) sensor as O2 and right oxygen (O2) sensor as O2R.

Using DRB, set engine speed to 1500 RPM. Read left O2 sensor voltage. If left O2 sensor voltage is always less than 0.5 volt, go to step 3). If left O2 sensor voltage is always more than 0.5 volt, go to next step.
If LEFT O2S STAYS ABOVE CENTER (RICH) trouble code is not in memory, replace leaking injector for left intake manifold bank. If LEFT O2S STAYS ABOVE CENTER (RICH) trouble code is in memory, a condition causing engine to run rich in all cylinders is indicated. Go to TEST NTC-1A .
At this time, the condition required to set trouble code is not present. LEFT O2S STAYS ABOVE CENTER (RICH) trouble code sets if left O2 sensor signal stays more than 0.5 volt but less than 1.2 volts without changing for more than 8 minutes. Possible causes are: high fuel pressure, other engine sensor calibrations, ignition system failure, left O2 sensor failure, or fuel contamination. Go to TEST NTC-1A .