2021 Honda Civic Service and Repair Manual

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Factory-Grade Data

2021 Honda Civic service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Electrical diagnostics with wiring diagrams
  • Coverage across major systems: engine, transmission/driveline, brakes, steering, suspension, HVAC, and more

Trims covered

  • Type R Hatchback 4-Door
  • Sport Sedan 4-Door
  • i-Style Sedan 4-Door
  • Sport Hatchback 4-Door
  • Sport Touring Hatchback 4-Door
  • EX Sedan 4-Door
  • Touring Sedan 4-Door
  • LX Hatchback 4-Door
  • EX Hatchback 4-Door
  • LX Sedan 4-Door
  • Type R Limited Edition Hatchback 4-Door
  • EX-L Sedan 4-Door

Engines covered

  • 2.0L 1996CC 122Cu. In. l4 GAS DOHC Turbocharged
  • 2.0L 1996CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
  • 1.5L 1497CC l4 GAS DOHC Turbocharged

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

2021 Honda Civic Recalls & Complaints

NHTSA #23V45800029/06/2023Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:MASTER CYLINDER

Honda (American Honda Motor Co.) is recalling certain 2020-2021 Civic, 2020-2023 Ridgeline, 2021-2023 Passport, 2021-2022 Pilot, and 2020 Acura MDX vehicles. The tie rod fastener that connects the br

Consequence

Brake master cylinder separation can cause a loss of brake function and increase the risk of a crash

Remedy

Dealers will inspect and repair the brake booster assembly as necessary, free of charge. Owner noti

NHTSA #23V85800018/12/2023Component: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP

Honda (American Honda Motor Co.) is recalling certain 2013-2023 Honda Accord, Civic Coupe, Civic Sedan, Civic Hatchback, Civic Type R, CR-V, HR-V, Ridgeline, Odyssey, Acura ILX, MDX, MDX Hybrid, RDX,

Consequence

Fuel pump failure can cause an engine stall while driving, increasing the risk of a crash.

Remedy

Dealers will replace the fuel pump module, free of charge. Owner letters were mailed September 6, 2

NHTSA #24V06400001/02/2024Component: AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER

Honda (American Honda Motor Co.) is recalling certain 2020-2022 Pilot, Accord, Civic sedan, HR-V, Odyssey, 2020 Civic coupe, Fit, 2021-2022 Civic hatchback, 2021 Civic Type R, Insight, 2020-2021 CR-V,

Consequence

An air bag that deploys unintentionally during a crash can increase the risk of injury.

Remedy

Dealers will replace the seat weight sensors, free of charge. Owner notification letters were maile

TSB #11021745

Service Bulletin - Oil leak at timing chain tensioner inspection cover due to possible insufficient sealant adhesion on inspection cover.

TSB #11011792

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2024 Accord 1.5Ls, 2021-2024 Civics 1.5Ls, 2023-2024 CR-Vs 1.5Ls, and 2017 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 [Catal

TSB #11010549

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2018-2024 Accord 1.5Ls, 2021-2024 Civics 1.5Ls, 2023-2024 CR-Vs 1.5Ls, and 2017 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 [Catal

TSB #11007887

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2020-2021 Civics, 2020-2022 CR-Vs, 2022-2023 Pilots & Passports with a customer complaint of the center display flickering, flashing, or frozen (Civics and CR-Vs

TSB #11006244

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2020-2021 Civics, 2020-2022 CR-Vs, 2022-2023 Pilots & Passports with a customer complaint of the center display flickering, flashing, or frozen (Civics and CR-Vs

TSB #11005269

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2020-2021 Civics, 2020-2022 CR-Vs, 2022-2023 Pilots & Passports with a customer complaint of the center display flickering, flashing, or frozen (Civics and CR-Vs

TSB #11004269

Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2020-2021 Civics, 2020-2022 CR-Vs, 2022-2023 Pilots & Passports with a customer complaint of the center display flickering, flashing, or frozen (Civics and CR-Vs

TSB #11002711

Service Bulletin - Due to a new North America regulation which introduces a new refrigerant and oil requirement, the compressor shaft seal may leak. American Honda is extending the warranty on the A/C compressor shaft seal from the original

Showing the 8 most recent of 73 technical service bulletins on file with NHTSA.

20230522Component: FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKINGCrash reportedFire reported

Driving down the highway about 70 mph and it started to rain so little that I had not even needed the wipers yet. Then out of nowhere with absolutely no warning what so ever the breaks locked up and t

20230522Component: SERVICE BRAKESCrash reportedFire reported

Driving down the highway about 70 mph and it started to rain so little that I had not even needed the wipers yet. Then out of nowhere with absolutely no warning what so ever the breaks locked up and t

20230522Component: VEHICLE SPEED CONTROLCrash reportedFire reported

Driving down the highway about 70 mph and it started to rain so little that I had not even needed the wipers yet. Then out of nowhere with absolutely no warning what so ever the breaks locked up and t

20250313Component: AIR BAGSCrash reported2 injured

The contact owned a 2021 Honda Civic. The contact stated that his wife was driving at 30-35 MPH, when another vehicle suddenly merged in front of the vehicle causing a T-bone collision. The vehicle wa

20250509Component: SERVICE BRAKESCrash reported

My 2021 Honda civic ex’ forward collision sensor light flashed mid intersection my brakes locked up causing me to be a victim of a hit and run. As I was in between policies with my insurance therefo

Showing the 5 most serious of 189 complaints filed with NHTSA.

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