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HOMESERVICE MANUALSPLYMOUTH1984HORIZON BASE, 1.6 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 4 (ENGINE CONTROLS - TESTS W/CODES - 3.0L)DTC & FAULT CODES/MESSAGESCODES/MESSAGES (NOTE: FOR DTC TABLE, SEE TEST TC-1A UNDER "SELF-DIAGNOSTICS.")CODE 51
1984 Plymouth Horizon Base, 1.6 A

Code 51

1984 Plymouth Horizon Base, 1.6 ASECTION Code 51
WARNING: This page is about a different car, the 1994 Plymouth Sundance, 1994 Plymouth Acclaim, 1994 Dodge Spirit, 1994 Dodge Shadow, and 1994 Chrysler LeBaron. However, it is still accessible from the selected car via links, so may be relevant.

DRB displays O2S STAYS BELOW CENTER (LEAN), LEFT O2S SIGNAL STAYS BELOW CENTER (LEAN), or RIGHT O2S SIGNAL STAYS BELOW CENTER (LEAN). Condition is: oxygen sensor input indicates lean air/fuel ratio condition during engine operation.



DRB displays LEAN OPERATION AT WIDE OPEN THROTTLE. Condition is: lean air/fuel mixture detected during Wide Open Throttle (WOT) operation. Drain and remove fuel tank. Clean fuel tank to remove contaminants. Replace inlet strainer on fuel pump module.

RENDER: 1.0x

NO RELATED

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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.