LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 1988 >> RX-7 Base, 2D Convertible >> Repair and Diagnosis >> Engine Performance >> System >> CEC System >> Trouble Shooting >> Self-Diagnosis >> Trouble Code No. 05
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Trouble Code No. 05

  1. Check all connections and repair as necessary. Check for continuity between oxygen sensor terminal and ECU terminal "2D". See Figure . If no continuity exists, check for open or shorted circuit.
  2. If continuity exists, check feedback system operation. See FEEDBACK SYSTEM  under TESTING in this article. DO NOT  perform step 3) under FEEDBACK SYSTEM. Repair as necessary.
scientia non olet · About LEMON Manuals