To help every US driver understand what their car is telling them — accurately, safely, and in plain English.
EngineLightFixers.com publishes guides, diagnostic explanations, and product reviews covering check engine lights, OBD‑II fault codes, and DIY repair procedures. Every piece of content we publish must meet one test: would a qualified mechanic approve this advice for a first-time DIYer?
We serve the United States automotive market. All emission standards, OBD‑II regulations, repair cost estimates, and product availability references are verified for US drivers. Where guidance differs for international vehicles, we note it explicitly.
Real-world diagnostic testing on US-spec vehicles
Mechanic-reviewed technical accuracy
Primary OEM sources, OBD‑II standards bodies
Full disclosure of affiliates, corrections policy, named authors
What We Will and Won’t Do
Our editorial decisions are made by our editorial team — not by advertisers, affiliate partners, or product manufacturers. These are the lines we do not cross.
Every Guide Has a Human Behind It
We do not publish content from unknown sources. Every article is produced, reviewed, and signed by a named team member with verifiable automotive knowledge.
Lead Author — Daniel
Head of Content · New York, US
Responsible for researching, writing, and publishing all guides. Daniel brings hands-on automotive diagnostic experience to every article and personally tests DIY procedures before publishing step-by-step instructions.
Certified Mechanic Reviewer
ASE-Certified Technical Accuracy Review
Every guide covering diagnostic procedures, fault code interpretation, or component replacement is reviewed by a certified mechanic before publication. The reviewer verifies safety steps, repair cost accuracy, and OEM specification compliance.
Managing Editor
Editorial Standards & Content Oversight
Ensures every published piece meets our editorial standards, plain-language guidelines, and E‑E‑A‑T requirements. Reviews all content for clarity, structure, appropriate safety warnings, and correct affiliate disclosure placement before publication.
No AI-Only Content Policy
EngineLightFixers.com does not publish AI-generated content that has not been reviewed, edited, and verified by a human with automotive knowledge. Where AI tools assist in research or drafting, a qualified team member must review every technical claim, test every procedure, and sign off on the final article before it is published. An article written entirely by AI with no human review will never appear on this site.
6 Steps Before Any Guide Goes Live
No article is rushed to publication. Every guide passes through this process in sequence — a step cannot be skipped.
Topic Research & Keyword Validation
AuthorityWe verify genuine search demand using keyword research tools. Topics are selected because real US drivers are asking the question — not because they are easy to rank for or carry high affiliate commissions. We confirm that our intended angle is more accurate or more helpful than existing results before beginning.
Primary Source Research
ExpertiseResearch begins with primary sources: OEM service manuals, SAE International standards, the EPA’s OBD‑II regulation documentation (40 CFR Part 86), NHTSA Technical Service Bulletins, and manufacturer-issued Diagnostic Trouble Code (DTC) definitions. Secondary sources (repair forums, other auto sites) are used only to understand common driver experiences — never as a substitute for OEM data.
Real-World Verification & Testing
ExperienceFor how-to guides, procedures are tested on actual US-spec vehicles before being written up. For scanner reviews, products are connected to OBD‑II ports, codes are read and cleared, and real diagnostic data is compared against claimed specifications. We do not describe procedures we have not performed. Where a procedure cannot be tested firsthand, we note this and limit claims to what OEM documentation confirms.
Writing & Safety Language Review
TrustThe guide is written to a plain-English standard. Every guide must include: a clear statement of what the reader will learn, explicit safety warnings before any procedure that carries injury or vehicle damage risk, a “when to see a mechanic instead” section where applicable, and accurate cost estimates cross-referenced against current US parts pricing. The Flesch-Kincaid reading level is reviewed — we target Grade 8–10 accessibility.
Technical Mechanic Review
ExpertiseBefore publication, a certified mechanic reviews the technical content. They check: all step sequences against OEM service procedures, torque specs and tool requirements, emissions compliance statements, safety warning completeness, and whether the guide’s DIY recommendation is appropriate for a non-professional. The reviewer’s name and review date appear on the published article.
Publication with Full Metadata
TrustThe article is published with: a named author byline, an in-article affiliate disclosure (if applicable), the publication date, the last-reviewed date, HowTo or FAQ schema markup, and a scheduled review reminder set for 12 months after publication. No guide is marked “final” — every article has a future review date attached.
Where Our Information Comes From
✅ Primary Sources We Use
- ◆ OEM service manuals — manufacturer-issued repair documentation for specific vehicle years and models
- ◆ SAE International standards — J1979, J2190, J2012 OBD‑II diagnostic standards
- ◆ EPA OBD‑II regulations — 40 CFR Part 86, EPA onboard diagnostics requirements
- ◆ NHTSA Technical Service Bulletins — official safety-related repair recommendations
- ◆ CARB emissions standards — California Air Resources Board OBD requirements where applicable
- ◆ RepairPal / AutoMD cost data — US-market repair cost benchmarks for consumer guidance
- ◆ Hands-on scanner testing — physical OBD‑II port connections and live data capture
🇺🇸 US Market Verification Standards
All content targets the United States automotive market. Before publication, we verify:
- → OBD‑II compliance applies to US 1996+ vehicles (not EU EOBD)
- → Emissions regulations cited are EPA/CARB, not EU/EEA
- → Part prices reference US retailers (AutoZone, Amazon US, NAPA)
- → Scanner products link to Amazon.com (not .co.uk or other regions)
- → Smog test / inspection references are state-specific where relevant
✗ Sources We Never Use as Primary
- ✗ Other automotive websites or blogs without OEM citations
- ✗ YouTube repair videos as the sole source of a procedure
- ✗ Reddit, forums, or social media for technical claims
- ✗ AI-generated content without independent human verification
- ✗ Product manufacturer marketing copy for technical specifications
How We Test and Review OBD2 Scanners
We review OBD‑II scanners, diagnostic tools, and automotive parts. No product receives a recommendation unless it has passed all stages of this process.
Independent Purchase
Products are independently purchased by our team from US retailers. We do not accept free review units in exchange for positive coverage.
Live Connection Testing
Each scanner is connected to an OBD‑II port on a real vehicle. We verify code reading, code clearing, live data streaming, and advertised compatibility claims.
Specification Verification
Advertised specs — vehicle compatibility, protocol support, system coverage — are independently verified against OBD‑II port data and OEM documentation.
Competitive Benchmarking
Each product is evaluated relative to alternatives at the same price point. A product ranking #1 must genuinely outperform its alternatives in the criteria most relevant to the use case.
Affiliate commission has zero influence on review scores. A product that pays us 8% commission will receive the same scoring treatment as a product that pays 3% — or no commission at all. We will recommend a non-affiliate product over an affiliated one when our scoring process identifies it as the better choice for the reader.
How We Score OBD2 Products
Our final product scores are calculated from six weighted criteria. Every criterion is scored independently before any overall rating is assigned.
We verify that the scanner correctly identifies known fault codes on test vehicles, matches OEM DTC descriptions, and does not generate false positives.
Verified against multiple makes (domestic, Asian, European) and model years. Compatibility claims are checked, not taken from manufacturer marketing alone.
Evaluated by a tester unfamiliar with the specific device. Time-to-first-scan and UI clarity are measured. App connectivity (Bluetooth/Wi-Fi) is tested on both iOS and Android where applicable.
Scored relative to alternatives in the same price tier. We do not penalise budget scanners for lacking professional features, or premium scanners for premium pricing — each is compared only to its direct competitors.
Physical inspection of connector housing, cable strain relief, display quality, and button feel. Warranty terms and software update policy are noted.
We check update frequency, whether updates are free or paid, app store ratings history, and known compatibility issues with newer OBD‑II protocols (CAN FD, DoIP).
How We Make Money — and Why It Does Not Affect Our Advice
Amazon Associates Program
EngineLightFixers.com is a participant in the Amazon Services LLC Associates Program — an affiliate advertising program that allows us to earn a commission when readers purchase products through our links at no additional cost to you.
Every article containing Amazon affiliate links displays an in-article disclosure statement before the first affiliate link appears. This disclosure is placed above the fold — never in the footer or on a separate page only.
Commission separation rule: Our editorial team does not know the commission rate of any product during the review and scoring process. Commission data is only applied to a product’s affiliate link after the editorial score is finalised.
Display Advertising (Google AdSense)
We display Google AdSense advertisements on this site. These are programmatic contextual ads selected by Google’s algorithm based on page content and reader context — not by us.
AdSense revenue is entirely separate from our editorial process. Advertisers whose products appear in ads have no influence on which products we review, recommend, or how we score them. An ad appearing alongside a review article does not constitute endorsement of that advertiser.
Ad placement policy: We do not allow paid ad placements that are positioned to appear as editorial content. All paid content is visually distinct from organic content.
FTC Compliance Statement
In compliance with the US Federal Trade Commission’s 16 CFR Part 255 guidelines, EngineLightFixers.com discloses all material connections between our content and any commercial relationships. This includes but is not limited to: affiliate commissions, free review products, sponsored content, and advertising revenue. If you have questions about any specific commercial relationship, contact us at [email protected] .
How We Keep Information Current
Vehicle technology, OBD‑II standards, product lines, and repair costs change. Outdated automotive advice is not just unhelpful — it can lead drivers to make unsafe decisions.
12-Month Review Cycle
Every published article has a scheduled review date set 12 months after publication. On that date, the entire article is re-verified against current OEM data, current pricing, and current product availability.
Triggered Updates
We update articles immediately when triggered by: NHTSA Technical Service Bulletins affecting a covered vehicle, OEM changes to diagnostic procedures, product recalls or discontinuations, or a confirmed reader report of inaccuracy.
Update Transparency
Every updated article displays: original publication date, last-reviewed date, and a brief note at the top of the article describing what changed and why. We do not quietly overwrite historical information.
Annual Model Year Review
Each calendar year, all vehicle-specific guides are audited for new model year differences. Guides that cover 2020–2024 vehicles receive an addendum noting any 2025–2026 procedure or specification changes.
We Get Things Wrong. Here is What We Do About It.
Automotive diagnostics is complex. We acknowledge errors, correct them promptly, and document what changed — without exception.
Correction Severity Scale
Sponsored Content Rules
EngineLightFixers.com occasionally accepts sponsored content from automotive brands. These are the non-negotiable rules that govern it.
✅ What Sponsored Content Must Include
- ✓ A clear “Sponsored Content” or “Paid Partnership” label as the very first element of the article — before the headline
- ✓ The name of the sponsoring brand disclosed in full
- ✓ Technical claims reviewed by our mechanic reviewer for accuracy
- ✓ All safety warnings our editorial standards require for any vehicle guide
- ✓ A rel=”sponsored” tag on any outbound links to the sponsoring brand
✗ What Sponsors Cannot Do
- ✗ Request removal of accurate negative information about their product
- ✗ Require that competing products not be mentioned or compared
- ✗ Control the wording of technical descriptions or safety warnings
- ✗ Have a sponsored article appear without a label in search results or social sharing previews
- ✗ Pay for an editorial review score — sponsored content and scored product reviews are entirely separate formats
Current status: EngineLightFixers.com is currently accepting sponsored content enquiries from automotive tool brands, OBD‑II scanner manufacturers, and US auto parts retailers whose products are genuinely relevant to our audience. To enquire, contact [email protected] with “Sponsored Content Enquiry” in the subject line. We reserve the right to decline any partnership that conflicts with our editorial independence policy.
Questions About This Policy?
If you have questions about our editorial standards, want to report an inaccuracy, or are interested in a sponsorship — we respond to all editorial enquiries within 48 business hours.
Editorial Policy · Version 1.0 · First published: April 2026 · Last reviewed: April 2026 · Next scheduled review: April 2027
This policy applies to all content published on enginelightfixers.com and supersedes any prior editorial guidelines.