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.
1993 Honda Civic CXFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Summary
- Diagnostic Trouble Code Charts
- Notes
- Engine Controls - Tests W/Codes
- Code/No Code - No Start Trouble Shooting
- Code 1 - D15B8 - Oxygen Sensor (O2S) Circuit (Federal Model Only)
- Code 1 - Heated Oxygen Sensor(Ho2S) Circuit (Exc. Fed. D15B8)
- Code 3 - Map Sensor Circuit
- Code 4, 8 And/Or 9 - TDC/CKP/CYP Sensor
- Code 5 - Except D15B7 - Map Sensor Circuit
- Code 5 - D15B7 - Map Sensor Circuit
- Code 6 - Engine Coolant Temperature (ECT) Sensor
- Code 7 - Throttle Position (TP) Sensor
- Code 10 - Intake Air Temperature (IAT) Sensor
- Code 12 - EGR System
- Code 13 - Barometric Pressure (BARO) Sensor
- Code 14 - Idle Air Control (IAC) Valve
- Code 15 - Ignition Output Signal
- Code 16 - Fuel Injectors
- Code 17 - Vehicle Speed Sensor (VSS)
- Code 19 - Lock-Up Control Solenoid Valve
- Code 20 - Electrical Load Detector (Eld)
- Code 21 - VTEC Solenoid Valve
- Code 22 - VTEC Pressure Switch
- Code 41 - Heated Oxygen Sensor(Ho2S) Heater (Exc. Fed. D15Z1)
- Code 41 - Heated Oxygen Sensor (Ho2S) Heater (D15Z1 Fed.)
- Code 43 - D15B8 - Heated Oxygen Sensor (Ho2S) Heater (Fed.)
- Code 48 - D15Z1 Heated Oxygen Sensor (Ho2S) (Fed.)
Factory Service Tools
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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.