2020 Toyota Avalon 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, torque values, and reference data
- Electrical diagnostics with full wiring diagrams
- Coverage across major systems: engine, transmission/driveline, brakes, steering, suspension, HVAC, and more
- Diagnostic trouble codes and troubleshooting flow
- Maintenance schedules and fluid capacities
Trims covered
- Hybrid Limited
- Hybrid XLE
- Hybrid XSE
- Limited
- TRD
- Touring
- XLE
- XSE
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
- Maintenance & Lubrication
- Specifications
- Steering
- Suspension
- Transmission, Clutch, & Transfer Case
- Diagnostic Trouble Codes
- Technical Service Bulletins
- Wiring Diagrams
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2020-2021 Avalon, Avalon Hybrid, Corolla, Highlander, Highlander Hybrid, RAV4, RAV4 Hybrid, Lexus ES350, Lexus RX350, Lexus RX450
An air bag that does not deploy during a crash increases the risk of injury.
Dealers will inspect and replace the sensor as necessary, free of charge. Interim letters notifying
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2018-2019 4Runner, 2019-2020 Avalon, 2019 Corolla Hatchback, 2017-2019 Highlander, 2018-2020 Camry, 2020 Corolla, 2018-2019 Land
If the fuel pump fails, the engine can stall while driving, increasing the risk of a crash.
Toyota will notify owners, and dealers will replace the fuel pump assembly with an improved one, fre
OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26.
Some 2018 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software.
Some 2005 2026 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a musty odor is present. Follow the procedures in this bulletin to remediate the odor and address this condition. The purpose of this Servic
The specific condition covered by this program is for a small engine coolant leak that can occur from the flow shut-off valve that can allow coolant to drip on other parts of the vehicle. This can cause "Engine Maintenance Required" to be d
The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service Bulletin aid in locating, inspecting, and repairing refrigerant
To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on how to retrieve the data from the system and are only to be u
To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on how to retrieve the data from the system and are only to be u
Although the flow shut-off valve is covered by Toyotas New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers ownership experience. Toyota is providing coverage for repairs
Showing the 8 most recent of 172 technical service bulletins on file with NHTSA.
I represent the family of a fatally injured rollaway victim. It is on their behalf I am reporting the circumstances of this incident and to strongly urge that NHTSA update the rollaway requirements sp
I represent the family of a fatally injured rollaway victim. It is on their behalf I am reporting the circumstances of this incident and to strongly urge that NHTSA update the rollaway requirements sp
A couple of months ago, my car started running a little rough as it would sit in idle mode. When suddenly my check engine light came on. I checked the codes and they seemed to be P0445 Evaporitive em
To Whom It May Concern, I am filing this complaint to report Right Toyota in Scottsdale, Arizona, and Toyota Motor Corporation for their mishandling of a critical airbag safety recall (23TA15) on my
TIE ROD LOOSE I heard a clunking noise while turning the steering wheel to the left at very low speeds. Took car in for service Service Mechanic found left outer tie rod end "with play, loose" Safety
Showing the 5 most serious of 13 complaints filed with NHTSA.
