Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPLYMOUTH1984HORIZON BASE, 1.6 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 7 (ENGINE CONTROLS - TESTS W/CODES - 2.2L)SELF-DIAGNOSTIC TESTSTEST TC-8A - O2S STAYS ABOVE CENTER (RICH) (DTC 52)
1984 Plymouth Horizon Base, 1.6 A
Test TC-8A - O2S Stays Above Center (Rich) (DTC 52)
1984 Plymouth Horizon Base, 1.6 ASECTION Test TC-8A - O2S Stays Above Center (Rich) (DTC 52)
WARNING: This page is about a different car, the 1994 Plymouth Sundance and 1994 Dodge Shadow. 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 TABLE. For wiring diagrams, see WIRING DIAGRAMS
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- Start engine and apply parking brake. Using DRB, set engine speed to 1500 RPM. Using DRB, read oxygen sensor voltage. If oxygen sensor voltage is always more than .5 volt, condition required to set trouble code is not present at this time. Go to next step. If oxygen sensor voltage is not always more than .5 volt, go to step 3).
- The O2S STAYS ABOVE CENTER (RICH) trouble code sets if oxygen sensor output voltage stays at more than .5 volt, but less than 1.2 volts without changing for at least 8 minutes. Possible causes are: high fuel pressure, other engine sensor calibration failures, ignition system failure, oxygen sensor failure or mechanical engine failure. Go to TEST NTC-1A .
- Check oxygen sensor connector for excessive dirt and/or grease build-up. Closely check oxygen sensor connector between Black/Dark Green wire (Dark Green/White wire on Dakota) and Dark Green/Black wire (Dark Green/Orange wire on Dakota).
- If excessive dirt and/or grease build-up is present, clean oxygen sensor connector as necessary. Perform TEST VER-2 . If excessive dirt and/or grease build-up is not present, a condition causing engine to run rich is indicated. Go to TEST NTC-1A.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.