General disclaimer
The information provided on Check Engine Light ("the Site," "we," "us") is for general informational and educational purposes only. While we work hard to ensure the accuracy and completeness of the content, we make no representations or warranties of any kind, express or implied, about the accuracy, reliability, suitability, or availability of the Site or its contents.
Any reliance you place on information from the Site is strictly at your own risk. In no event will we be liable for any loss or damage including, without limitation, indirect or consequential loss or damage, arising from the use of or reliance on information contained on the Site.
Not professional automotive advice
Every vehicle is different. Factors that affect diagnosis and repair include:
- Specific year, make, model, and trim — the same OBD-II code can have different common causes on different vehicles
- Engine variant — a 2.4L 4-cylinder and a 3.5L V6 in otherwise identical vehicles often need different diagnostic approaches
- Service history — past repairs, maintenance patterns, and previous modifications affect current problems
- Operating conditions — climate, driving style, fuel quality, and geographic altitude all influence diagnostics
- Interaction of symptoms — multiple simultaneous issues can mask or mimic each other in ways that require hands-on diagnosis
A qualified mechanic examining your specific vehicle with professional diagnostic equipment will always be more accurate than any general guidance on this Site.
Accuracy of information
We strive to provide accurate and current information, but:
- Vehicle manufacturer specifications change regularly
- New OBD-II codes are added by the SAE
- Repair procedures evolve with new technology
- Part numbers, pricing, and availability change over time
- Manufacturer-specific bulletins and recalls are issued continuously
Information that was accurate when published may become outdated. We review content quarterly and update the "Last updated" date on each page when substantive changes are made. However, we cannot guarantee that every page reflects the most current information at any given moment.
DIY repair & safety warnings
Your responsibility
If you choose to perform any repair or maintenance procedure based on information from this Site, you acknowledge and accept:
Know your skill level and stay within it. Work in a well-ventilated area. Use proper personal protective equipment. Use correct jack stands, never just a jack. Disconnect the battery when working on electrical systems. Follow manufacturer torque specs. Know when to stop and call a professional.
Work under a vehicle supported only by a jack. Smoke or use open flames near fuel. Attempt hybrid/EV high-voltage work without proper training. Remove warning labels. Ignore unfamiliar fluid leaks, electrical smells, or abnormal sounds. Continue a repair when you're unsure what you're doing.
Hybrid & electric vehicle warning
Hybrid and electric vehicles use high-voltage battery systems (typically 200V–800V DC) that can cause immediate death from electrical shock. We strongly advise that any repair involving the high-voltage system, battery, or orange cables be performed by a technician specifically trained and certified on hybrid/EV systems.
Repair cost estimates
The repair prices shown on this Site, including in our cost calculator, are general estimates based on average US market pricing as of the most recent update.
Actual prices vary based on
- Geographic location — labor rates in California or New York can be 2x those in rural areas
- Vehicle make and model — luxury and European vehicles routinely cost 30–70% more to repair
- Shop type — dealership labor rates are typically 30–50% higher than independent shops
- Parts quality — OEM vs. aftermarket vs. salvage parts can vary by 500% or more
- Scope of work — once disassembled, additional issues may be discovered
- Shop overhead, warranties, and diagnostic fees — each shop structures these differently
OBD-II code interpretations
The OBD-II diagnostic trouble code (DTC) descriptions and explanations on this Site are simplified summaries intended for general understanding.
Official OBD-II code definitions are published by SAE International in standard J2012. Many manufacturers add additional codes and interpretations specific to their vehicles. Our explanations:
- Cover generic SAE codes (P0xxx, P2xxx, P3xxx)
- Do not cover all manufacturer-specific codes (P1xxx)
- May not reflect the latest revisions to SAE standards
- Are summaries, not the full technical definition
- Discuss "most common" causes, which may not apply to your specific case
For authoritative code information specific to your vehicle, consult your vehicle's service manual, a manufacturer technical service bulletin (TSB), or a professional technical database like AA1Car.com, NHTSA's databases, or the OEM's service portal.
Interactive tools disclaimer
Our Site includes interactive tools such as the OBD-II code lookup, repair cost calculator, and symptom checker. These tools are provided for general informational purposes and are not diagnostic instruments.
What these tools do NOT do
- They do not diagnose actual problems with your vehicle
- They do not replace a proper OBD-II scanner or in-person inspection
- They do not account for vehicle-specific variables unique to your car
- They cannot detect intermittent or complex multi-system faults
- They are not medical or safety-critical software
Results from our tools are starting points for further investigation, nothing more. Never rely solely on a web-based tool to decide whether to drive a vehicle, replace a major component, or delay a repair.
Product mentions & recommendations
We mention specific products by name when we find them relevant (e.g., ANCEL AD310 scanner, CRC MAF Sensor Cleaner, BlueDriver Pro). These mentions represent our opinion based on professional experience, not endorsements or guarantees.
Important points
- Product availability, pricing, and specifications change over time
- A product that worked well for us may not work for your specific situation
- Manufacturers may change product formulations, features, or quality over time
- Our opinions reflect experience at a point in time and may become outdated
Before purchasing any product mentioned here, research current reviews, verify compatibility with your specific vehicle, and check the manufacturer's current documentation.
Affiliate links & monetization
If this changes
If we begin using affiliate programs, paid partnerships, or sponsored content in the future, we will:
- Update this Disclaimer to reflect the change
- Add clear disclosure language on every page containing affiliate links (e.g., "This post contains affiliate links" near the top)
- Use the
rel="sponsored"attribute on affiliate links as required by FTC and Google guidelines - Never let compensation override honest recommendations
You can always contact us at hello@cel.guide for the current status of our monetization practices.
External links disclaimer
Our Site contains links to external websites for reference and additional information. These may include government sites (NHTSA, EPA), professional organizations (ASE, SAE), technical databases (AA1Car), and fuel/product information sites (Top Tier Gas).
We do not:
- Control or endorse the content on external sites
- Guarantee the accuracy of information on external sites
- Accept responsibility for the privacy practices of external sites
- Maintain partnerships with linked sites (unless explicitly disclosed)
Links are provided for convenience. When you leave this Site, you are subject to the terms and privacy policies of the site you visit.
No medical or health claims
While we discuss topics like exhaust fumes, carbon monoxide leaks, and potential health hazards associated with vehicle malfunctions, nothing on this Site constitutes medical advice.
If you suspect a health issue related to your vehicle (symptoms of carbon monoxide poisoning, for example), seek immediate medical attention from a qualified healthcare provider. In emergencies, call 911 (US) or your local emergency services.
Emissions laws & legal compliance
Our Site discusses emissions-related diagnostics, repairs, and inspection processes. Emissions laws vary significantly by jurisdiction:
- Federal: EPA regulations apply nationwide
- State: California (CARB) has the strictest standards; other states follow federal or mixed rules
- Local: Some counties have inspection programs; others do not
For current emissions requirements in your area, consult your state's DMV or environmental agency. CARB-specific requirements for California residents are available at ww2.arb.ca.gov.
Warranty implications of DIY work
Performing your own repairs or modifications may affect your vehicle's warranty coverage. Under the Magnuson-Moss Warranty Act (US federal law), manufacturers cannot void your entire warranty simply because you performed DIY work. However:
- They can deny warranty claims for damage caused by improper DIY work
- Using non-OEM parts may affect coverage for related components
- Modifications outside manufacturer specifications may void related warranty items
- Extended warranty and service contracts have their own rules, often stricter than factory warranty
If your vehicle is still under warranty, weigh the cost savings of DIY work against the potential loss of warranty coverage. For warranty-period repairs, the dealership is usually the right choice.
Errors, omissions & updates
Despite our best efforts, content on this Site may contain errors, typos, or outdated information. If you notice something wrong:
- Please contact us with the page URL and the specific error
- We review feedback and update pages promptly when corrections are warranted
- Substantive updates are reflected in the "Last updated" date on the affected page
We reserve the right to modify, remove, or correct any content at any time without notice. Archived or cached versions of pages may contain outdated information.
Questions about this disclaimer
If you have questions about this Disclaimer or anything related to the accuracy, safety, or limitations of the information on this Site, please reach out:
General questions
For any questions about our content, corrections, or this Disclaimer:
Legal questions
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This Disclaimer is part of and should be read alongside our Terms of Use and Privacy Policy.