Exhibit 99.1

2021 Investor Presentation

Disclaimer 2 This presentation contains “forward-looking” statements, within the meaning of the federal securities laws, that are based on our management’s belief’s and assumptions and on information currently available to management. Forward-looking statements include information concerning our possible or assumed future results of operations, expected growth and business strategies, key operating metrics, financing plans, competitive position, industry environment, potential product offerings, potential market and growth opportunities and the anticipated outcome of any litigation.Forward-looking statements include all statements that are not historical facts and can be identified by terms such as “anticipates,” “believes,” “could,” “seeks,” “estimates,” “intends,” “may,” “plans,” “potential,” “predicts,” “projects,” “should,” “will,” “would” or similar expressions and the negatives of those terms. Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Forward-looking statements represent our management’s beliefs and assumptions only as of the date of this presentation. These statements do not guarantee future performance and speak only as of the date hereof and qualify for the safe harbor provided by Section 21E of the Securities Exchange Act of 1934, as amended, and Section 27A of the Securities Act of 1933. We refer all of you to the disclosures contained in the CarParts.com, Inc Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K filed with the Securities and Exchange Commission, including the risk factors set forth therein, for more detailed discussion on the factors that can cause actual results to differ materially from those projected in any forward-looking statements. Except as required by law, we assume no obligation to update these forward-looking statements publicly, or to update the reasons actual results could differ materially from those anticipated in the forward-looking statements, even if new information becomes available in the future.This presentation includes certain non-GAAP financial measures as defined by SEC rules. We have provided a reconciliation of those measures to the most directly comparable GAAP measures in this presentation, where applicable, as well as in the appendix to this presentation. We have not included a reconciliation of Adjusted EBITDA guidance to projected net income (loss) due to the high variability and difficulty in making accurate long-term forecasts and projections of our net operating loss carryforwards, which have a significant impact on future net income (loss). As a result, we are unable to quantify projected net income without unreasonable efforts.This presentation also contains estimates and other statistical data made by independent parties and by the Company relating to market size and growth and other data about the Company’s industry and estimated total addressable market. This data involves a number of assumptions and limitations, and you are cautioned not to give undue weight to such estimates. Neither the Company nor any other person makes any representation as to the accuracy or completeness of such data or undertakes any obligation to update such data after the date of this presentation. In addition, projections, assumptions, and estimates of our future performance and the future performance of the markets in which the Company operates are necessarily subject to a high degree of uncertainty and risk. All third-party trademarks, including names, logos and brands, referenced by the Company in this presentation are property of their respective owners. All references to third-party trademarks are for identification purposes only and shall be considered nominative fair use under trademark law.This presentation also includes certain preliminary unaudited financial and operating results of the Company for the year ended January 2, 2021. These preliminary results represent the Company's estimates, which are based only on currently available information and do not present all necessary information for an understanding of the Company's financial condition as of January 2, 2021 or results of operations for the year ended January 2, 2021. Undue reliance should not be placed on these preliminary estimates.

01 BACKGROUND 02 INDUSTRY LANDSCAPE 03 THE CARPARTS.COM SOLUTION 04 FINANCIALS & GROWTH 3

THE AUTO PARTS INDUSTRY IS EXPANDINGCars are Lasting Longer & Driving Further total addressable market cars on the road avg. age of cars on roadWE ARE ALIGNING TO THESE DEMANDS Source: 2021 AutoCare Association Factbook 5

MISSION Changing the way people repair their cars, and getting them back on the road 6

Large TAM with very low online penetrationAuto parts industry overdue for disruptionProprietary shoppable catalogImproved customer experience with guaranteed fit2-step distribution modelLower prices than competitors by cutting out the middlemenCurated experienceReducing the paradox of choice for consumersStrong unit economicsProfitable after COGS, CAC, and fulfillmentEarly inningsContinued growth expected via market penetration and adjacent services Investment Highlights 7

Significant Milestones FoundedU.S. Auto Parts1Umbrella company to more than a dozen brands 1995 LaunchedFirst eCommerce site 2000 IPONASDAQ: PRTS 2007 AcquiredJC WhitneyIncluding their parts catalog, warehouse, etc. 2010 New CEOLev PekerManagement team refresh with new vision 2019 8 1. Name changed to CarParts.com, Inc in 2020

Major Transformation in the Last 24 Months v New executive team with industry eterans and technical experts Fa ormed marketing, data science, technology, nd inventory forecasting teams f Pl 2019-PRESENT s Doubled distribution center footprint to nearly 1 million sq ftConsolidated 17 websites into 1 flagship ite and renamed companyOverhauled our website with a new mobile riendly and personalized user experienceaid off all outstanding debt and trade etters of credit 9

Trusted & Experienced Team 10 Sanjiv GomesCHIEF TECHNOLOGY OFFICER Houman AkhavanCHIEF MARKETING OFFICER Dave MorrisCHIEF MERCHANDISING OFFICER David KearVICE PRESIDENT, WAREHOUSE OPERATIONS Ryan LockwoodSENIOR VICE PRESIDENT, FINANCE David MenianeCHIEF OPERATING OFFICER & CHIEF FINANCIAL OFFICER Lev PekerCHIEF EXECUTIVE OFFICER OPERATIONAL EXCELLE NCE FINANCIAL DISCIPLINE EXTREME OWNERSHIP OUR CULTURE

liquidity 1 revenue YoY revenue growth visits in 2020 Stable, Growing & Profitable THE FASTEST GROWING RETAILER IN THE INDUSTRY3 gross profit margin revenue from return customers 2 Our Credit Agreement provides for an option to increase the aggregate principal amount from $30,000 to $40,000, subject to lender approval.At a one-year lookbackSource: Auto Care Week, based on YOY net sales growth 11

auto parts industry online penetration 2 One of the Last Industries to be Disrupted by eCommerce overall eCommerce online penetration 1 INDUSTRY LANDSCAPE ECOMMERCE PENETRATION DigitalCommerce360 – 02/19/2021 - Includes pet food, furniture, electronics, online travel2021 AutoCare Association Factbook Estimates 13

Do-It-For-Me (DIFM) CustomersProfessional mechanic installs partsTrusts the mechanic to pick the partLess brand sensitiveLess price sensitive GUARANTEEDFIT COMPETITIVEPRICING HIGH-QUALITYPARTS FASTSOLUTIONS Do-It-Yourself (DIY) Customers Work on their own carStrained by the paradox of choice.Will it fit? Is this the best price & quality?Hope that parts are exactly what they needMore price sensitive CUSTOMER NEEDS INDUSTRY LANDSCAPE 14

A Clear Competitive Advantage Pricing Shipping Distribution GQuality e Customer Tailored foruarante Service Auto Industry Dropship Unpredictable Unpredictable Third party No help choosingdistributors correct parts Marketplaces Haggle/bid for pricing Slow & unpredictable shipping Third party distributors No help choosing correct parts Brick-and-Mortar Very high due to overhead & channel conflict Buy online, pick up in-store focus Retail Good in-store customer service Competitive Fast & reliable Integrated supply chain 500 agents, live chat, email, phone 15

2-Step Distribution Advantage Manufacturerto CarParts.com+40% Cost $100 CarParts.comto customer+50% Price $150 Distributorto retailer+25% Cost $188 Manufacturerto brand+40% Cost $100 Brandto distributor+50% Cost $150 Retailerto customer+50% Price $281 Other companies1 16 1. For illustrative purposes only, markup varies

Real World Price Advantage Traditional B&M Less steps Less markups Lower price 17

Accelerated Shifts in Consumer Behavior CarParts.com provides a digital, convenient way to buy car parts Customers are prioritizing convenience & price transparency Customers are expecting personalized digital experiences An industry shift from offlineto online Shift to DIY & increase in personal mobility 18

The Best of Everything With No Paradox of Choice t e t g Guaranteed fi & low pricFas shippinCompany owned brand -s s Curated election ( Ultra fast websitemobile optimized) 2( -step distributionfactory to car) 20

CarParts.com Core Competencies Marketing& Data Science Technology Stack Proprietary Catalog Integrated Supply Chain Customer Service Team Customer Experience 21

Vehicledata Personal, demographic& device data Onsite transactional data Real-time user signals Offline engagement data Website Email Paid Ads SMS Social Customer profiling Predictive intelligence Machine learning Marketing & Data Science Inventory 22

LongBow• Proprietary catalog• 2 Million man-hours Custom-Built Technology Stack THE CARPARTS.COM SOLUTION Order management systemVending logic optimization Manager AssortmentGeographic demand Inventory Forecasting Warehouse managementResource scheduling HighJump GAIA Container consolidationInbound logistics Machine Learning Labor planning Dynamic pricingFreight optimization Data Lake Multi-source databaseReal-time analytics• 23

Proprietary Catalog THE CARPARTS.COM SOLUTION Headlights Side mirrors Tail lights Bumpers Wheel hub Bumper cover Headlight Side Mirrors Control arm ASSORTMENT BASED ON FAILURE RATES AND VEHICLES IN OPERATION Replacement Parts Hard Parts Performance & Accessories Brake discs & pads Shocks & struts 24 Wheel hubs Control arms Tonneau cover Fender flare Off-road bumper Receiver hitch

Our House Brands Est. 2021Brakes & Rotors 25 Est. 2020Suspension & Ride Control Est. 2020Automotive Electronics Est. 2020Pumps, Compressors, & Mechanical Parts Est. 2009Mirrors Est. 1915Performance & Accessories

NETWORK OPTIMIZEDfor multi-order shipments in one consolidated package DATA ANALYTICSto reduce shipping costs BOX ON DEMANDto make a box the exact size of the part being shipped OPTIMIZATIONability to pick, pack, and ship odd-shaped / bulky / oversized itemsand sheet metals global employees warehouse square footage distribution centers Targeted forplanned expansion Grand Prairie, TX Las Vegas, NV linois linois Peru, IlLa Salle, IlChesapeake, VA Torrance, CA(headquarters) Integrated Supply ChainCOMPANY-OPERATED DISTRIBUTION NETWORK 26

First Class Customer ServiceOVER 500 TEAM MEMBERS THE CARPARTS.COM SOLUTION chat response time increase to customer service employee team email response time sales phone response time service phone response time CRM INVESTMENTS TO CREATE BETTER CUSTOMER ENGAGEMENT for agent k nowled ge & co mmuni cation1 27 1. Source: Bizrate.com as of 03/06/21Median response times based on trailing 4 weeks

overall rating Delivering Superior Customer Experience THE CARPARTS.COM SOLUTION Source: Bizrate.com as of 03/06/21 I was lookCarParts reviewsing for a part for my car and could only find it on.com. It only took about 2 minutes to complete the order… All I had to do was type in what vehicle I have, and I found the part I was looking for in less than 30 seconds... 28

Simple & Seamless Online Experience Solving the customer's problem from any deviceIntuitive platform with over 800,000+ SKUs available onlineValue propositions that countQuality, speed, convenience and competitive pricingReal-time personalized experienceRemoving the paradox of choice by providing a proprietary and highly curated catalogSeamless transactionGet the parts, tools and resources you need without leaving your device 29

The Shift to EV Today of our current sales are agnostic to the powertrain 31

Electric vs. Gas-Powered VehiclesNOT AS DIFFERENT AS YOU MIGHT THINK Replacement Parts Similarities Differences Electric vehicles Gasoline cars Body parts 32 Hard Parts

TOMORROW TODAY | 33 Preventive Maintenance Repair & Installation Diagnostics

34 Stable Balance Sheet 1. Our Credit Agreement provides for an option to increase the aggregate principal amount from$30,000 to $40,000, subject to lender approval cash asset-based lending availability1 revolver debt inventory

Long Term Financial Targets FINANCIALS & GROWTH 2019 2020 Long Term Target Source Gross Margin After Freight 30.0% 35% 36 - 37% Product mix, channel mix, closer to customer Marketing & Customer Service 1 14.8% 15 - 17% 13 - 15% Retention marketing, direct to site, brand awareness Other Operating Operating leverage, Expenses 2 13.7% 15 - 16% 12 - 13% efficiencies, scalein headcount Adjusted EBITDA Margin 1.6% 3.6% 8 - 10% Above combined 35 Excludes certain other items including stock-based compensation, depreciation, and amortizationTechnology, fulfillment and other SG&A

I R @ C A R P A R T S . C O M C A R P A R T S . C O M / I N V E S T O R

Appendix

Consolidated Income Statement 38

Consolidated Balance Sheets 39

Adjusted EBITDA Reconciliation 40