2018 Subaru Impreza Service and Repair Manual

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Factory-Grade Data

2018 Subaru Impreza 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

  • Touring Hatchback 4-Door
  • Premium Sedan 4-Door
  • Convenience Hatchback 4-Door
  • Base Sedan 4-Door
  • Sport-tech Sedan 4-Door
  • Base Hatchback 4-Door
  • Premium Hatchback 4-Door
  • Touring Sedan 4-Door
  • Sport-tech Hatchback 4-Door
  • Limited Hatchback 4-Door
  • Convenience Sedan 4-Door
  • Sport Sedan 4-Door
  • Sport Hatchback 4-Door
  • Limited Sedan 4-Door

Engines covered

  • 2.0L 1995CC H4 GAS DOHC Naturally Aspirated

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

2018 Subaru Impreza Recalls & Complaints

NHTSA #21V58700029/07/2021Component: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP

Subaru of America, Inc. (Subaru) is recalling certain 2019-2020 Ascent, 2018 Forester, 2018-2020 Impreza, Legacy, Outback, 2018-2019 BRZ, WRX, and Toyota 86 vehicles. The low-pressure fuel pump insid

Consequence

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

Remedy

Dealers will replace the low-pressure fuel pump, free of charge. Owner notification letters were ma

NHTSA #19V74300018/10/2019Component: ELECTRICAL SYSTEM:SOFTWARE

Subaru of America, Inc. (Subaru) is recalling certain 2017-2019 Impreza and 2018-2019 Crosstrek vehicles. The Engine Control Module (ECM) may continue to power the ignition coil after the engine is s

Consequence

If a short circuit occurs while driving, the vehicle may stall, increasing the risk of a crash.

Remedy

Subaru will notify owners, and dealers will update the ECM software and inspect and replace the igni

NHTSA #19V74400017/10/2019Component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (P

Subaru of America, Inc. (Subaru) is recalling certain 2017-2018 Impreza and 2018 Crosstrek vehicles equipped with an aluminum Positive Crankcase Ventilation (PCV) valve. The PCV valve may come apart,

Consequence

An unexpected loss of power while driving can increase the risk of a crash.

Remedy

Subaru will notify owners, and dealers will inspect and, if necessary, replace the PCV valve, free o

NHTSA #21V26400015/04/2021Component: ELECTRICAL SYSTEM:SOFTWARE

Subaru of America, Inc. (Subaru) is recalling certain 2017-2019 Subaru Impreza and 2018-2019 Crosstrek vehicles. The Engine Control Module (ECM) may continue to power the ignition coil after the engi

Consequence

A short circuit in the ignition coils may cause a stall, increasing the risk of a crash.

Remedy

Subaru will notify owners, and dealers will update the ECM software, replace the ignition coils and,

NHTSA #22V62400012/08/2022Component: EXTERIOR LIGHTING:HEADLIGHTS

Subaru of America, Inc. (Subaru) is recalling certain 2017-2019 Impreza vehicles. The left and right side reflex reflector and left side low beam reflector may inadequately reflect light. As such, t

Consequence

Reflectors that do not provide adequate illumination reduce the driver's ability to see and increase

Remedy

Dealers will replace the front headlamp assemblies, free of charge. Owner notification letters were

TSB #11032040

This bulletin announces the service manual correction regarding clutch master cylinder reservoir service procedures.

TSB #11032039

This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.

TSB #11032035

This Bulletin provides the diagnostic procedures to be followed when addressing customer concerns of steering wheel/vehicle body vibration when driving at highway speeds when tire/wheel balance is suspected.

TSB #11032034

This Service Information Bulletin was developed to provide interim guidance for vehicles exhibiting DTC B2A20.

TSB #11030567

This bulletin contains information to help when attempting to complete the STARLINK Telematics subscription process, an Error Code 202 and / or 204 may occur preventing the process from completing successfully

TSB #11030561

This announcement provides information on the use of aftermarket services or tools for programming immobilizer keys/fobs.

TSB #11030560

This bulletin announces the new procedure and Warranty Fail Code for FirstTime air conditioning (A/C) performance concerns possibly resulting from an undetected A/C refrigerant leak.

TSB #11030557

This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.

Showing the 8 most recent of 500 technical service bulletins on file with NHTSA.

20190811Component: AIR BAGSCrash reported1 injured

THE SIDE AIRBAGS DID NOT DEPLOY AND 3 SENSORS WHERE ACTIVATED BUT BECAUSE OF THE ELECTRICAL PROBLEMS IT NEVER WENT OFF. *JS *JS

20190811Component: ELECTRICAL SYSTEMCrash reported1 injured

THE SIDE AIRBAGS DID NOT DEPLOY AND 3 SENSORS WHERE ACTIVATED BUT BECAUSE OF THE ELECTRICAL PROBLEMS IT NEVER WENT OFF. *JS *JS

20190811Component: VEHICLE SPEED CONTROLCrash reported1 injured

THE SIDE AIRBAGS DID NOT DEPLOY AND 3 SENSORS WHERE ACTIVATED BUT BECAUSE OF THE ELECTRICAL PROBLEMS IT NEVER WENT OFF. *JS *JS

20190127Component: AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULECrash reported1 injured

I WAS INVOLVE TO CAR ACCIDENT, I WAS A PASSENGER THE SEAT BELT WAS ON ME AND, PRAPORLY LUCKED TO THE SEAT. THE DRIVER AIRBAG DEPLOEY. HE DIDNT GET ANY DAMEGE TO HIS BODY. AND MY IARBAG DID NOT DEPLOEY

20190127Component: AIR BAGSCrash reported1 injured

I WAS INVOLVE TO CAR ACCIDENT, I WAS A PASSENGER THE SEAT BELT WAS ON ME AND, PRAPORLY LUCKED TO THE SEAT. THE DRIVER AIRBAG DEPLOEY. HE DIDNT GET ANY DAMEGE TO HIS BODY. AND MY IARBAG DID NOT DEPLOEY

Showing the 5 most serious of 181 complaints filed with NHTSA.

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