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 MANUALSHONDA2020CIVIC SI, 4D SEDANREPAIR AND DIAGNOSISENGINE PERFORMANCEFUEL DELIVERYENGINE CONTROL / ENGINE MECHANICAL - SERVICE, TESTING & TROUBLESHOOTING
2020 Honda Civic Si, 4D Sedan
Engine Control / Engine Mechanical - Service, Testing & Troubleshooting
2020 Honda Civic Si, 4D SedanSECTION Engine Control / Engine Mechanical - Service, Testing & Troubleshooting
- Adjustment
- Component Location Index
- Engine Block Assembly Component Location Index (1.5L Engine)
- Engine Block Assembly Component Location Index (K20C1)
- Engine Block Assembly Component Location Index (K20C2)
- Intake Air System and Exhaust System Component Location Index (1.5L Engine)
- Intake Air System and Exhaust System Component Location Index (K20C1) (2017 2018 2019 2020 2021)
- Intake Air System and Exhaust System Component Location Index (K20C2)
- Replacement
- Connecting Rod Bearing Replacement (1.5L Engine)
- Connecting Rod Bearing Replacement (K20C1) (2017 2018 2019 2020 2021)
- Connecting Rod Bearing Replacement (K20C2)
- Crankshaft Main Bearing Replacement (1.5L Engine)
- Crankshaft Main Bearing Replacement (K20C1) (2017 2018 2019 2020 2021)
- Crankshaft Main Bearing Replacement (K20C2)
- Valve Guide Replacement (1.5L Engine)
- Valve Guide Replacement (K20C1) (2017 2018 2019 2020 2021)
- Valve Guide Replacement (K20C2)
- Connector View
- PCM Connector for Inputs and Outputs (K20C1) (2017 2018 2019)
- PCM Connector for Inputs and Outputs (K20C1) (2020 2021)
- PCM Connector for Inputs and Outputs (K20C2)
- PCM Connector for Inputs and Outputs (L15B7 (except Si)/L15BY) (2019 2020 2021)
- PCM Connector for Inputs and Outputs (L15B7) (2016 2017 2018 2019)
- PCM Connector for Inputs and Outputs (L15BA/L15BY) (2017 2018 2019 2020 2021)
- PCM Connector for Inputs and Outputs (Si) (2017 2018 2019)
- PCM Connector for Inputs and Outputs (Si) (2020 2021)
- Learning Reset Clear
- Check
- General Information
- Test
- How to Information
- How to Connect the HDS
- How to Set Readiness Codes (EX, EX-T, EX-L)
- Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness Codes)
- Catalytic Converter Monitor and Readiness Code
- Evaporative Emission (EVAP) Control System Monitor and Readiness Code
- Air Fuel Ratio (A/F) Sensor Monitor and Readiness Code
- Air Fuel Ratio (A/F) Sensor Heater Monitor Readiness Code
- Misfire Monitor and Readiness Code
- Fuel System Monitor and Readiness Code
- Comprehensive Component Monitor and Readiness Code
- EGR Monitor and Readiness Code
- Inspection
- APP Sensor Signal Inspection
- Block and Piston Inspection (1.5L Engine)
- Block and Piston Inspection (K20C2/K20C1)
- Cam Chain Inspection (1.5L Engine)
- Cam Chain Inspection (K20C1) (2017 2018 2019 2020 2021)
- Cam Chain Inspection (K20C2)
- Camshaft Timing Inspection (1.5L Engine)
- Camshaft Timing Inspection (K20C1) (2017 2018 2019 2020 2021)
- Camshaft Timing Inspection (K20C2)
- Catalytic Converter Inspection
- Connecting Rod and Crankshaft End Play Inspection (1.5L Engine)
- Connecting Rod and Crankshaft End Play Inspection (K20C1) (2017 2018 2019 2020 2021)
- Connecting Rod and Crankshaft End Play Inspection (K20C2)
- Engine Compression Inspection (1.5L Engine)
- Engine Compression Inspection (K20C1) (2017 2018 2019 2020 2021)
- Engine Compression Inspection (K20C2)
- Engine Oil Jet Inspection (1.5L Engine)
- Idle Speed Inspection
- PCV Valve Inspection (K20C1) (2017 2018 2019 2020 2021)
- PCV Valve Inspection (K20C2)
- PCV Valve Inspection (L15B7/L15BA/L15BY)
- Turbocharger Bypass Control Solenoid Valve Inspection (K20C1) (2017 2018 2019 2020 2021)
- Turbocharger Bypass Control Solenoid Valve Inspection (L15B7/L15BA)
- Turbocharger Bypass Control Valve Inspection (K20C1) (2017 2018 2019 2020 2021)
- Turbocharger Bypass Control Valve Inspection (L15B7)
- Valve Inspection (1.5L Engine)
- Valve Inspection (K20C1) (2017 2018 2019 2020 2021)
- Valve Inspection (K20C2)
- Valve Stem-to-Guide Clearance Inspection (1.5L Engine)
- Valve Stem-to-Guide Clearance Inspection (K20C1) (2017 2018 2019 2020 2021)
- Valve Stem-to-Guide Clearance Inspection (K20C2)
- Removal, Installation And Inspection
- Air Cleaner Element Removal, Installation, and Inspection (1.5L Engine)
- Air Cleaner Element Removal, Installation, and Inspection (K20C1) (2017 2018 2019 2020 2021)
- Air Cleaner Element Removal, Installation, and Inspection (K20C2)
- Camshaft and VTC Actuator Removal, Installation, and Inspection (1.5L Engine)
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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.