Used Car Dealer Fraud Concealing Defects by Clearing 
          Check Engine or Other Light Display  
 

25+ Years Experience Auto Dealer Fraud 

Did you buy a Used Car in NJ or NY — Then the Check Engine Light Came On Days Later.  Dealers often clear diagnostic trouble codes (DTCs), reset the computer, or use temporary fixes so the car looks perfect during your test drive. Then the warning light returns, the car misfires, overheats, or stalls shortly after you drive off the lot. This can be illegal concealment violating the New Jersey Consumer Fraud Act and New York consumer protection laws.

Common Used Car Dealer Fraud Tactics Involving Warning Lights

Dealers know buyers check for lights during test drives. Common masking tactics include:

• Clearing diagnostic trouble codes (DTCs) with an OBD scanner right before the sale
• Disconnecting the battery to reset the vehicle's computer and stored data
• Tampering with readiness monitors so the car appears “fixed” after a quick drive cycle
• Using temporary additives, sealants, or quick part swaps that fail days later
• Warming up the vehicle before you arrive so cold-start problems stay hidden
• Turning off or disabling the check engine light entirely

Why this matters: Clearing codes does not fix the underlying defect. It simply resets the system. The light often returns once the vehicle completes its normal “drive cycle” and readiness monitors run again. A problem that appears within days of purchase strongly suggests it existed at the time of sale.  These practices can violate the New Jersey Consumer Fraud Act (N.J.S.A. 56:8-2), which prohibits “unconscionable commercial practices, deception, fraud… or the knowing concealment, suppression, or omission of any material fact.”

Federal Laws and Regulations 


42 U.S.C. §7522(a) states 

The following are prohibited-   (3) (A) to remove or render inoperative any device or element of design installed on or in a motor vehicle or motor vehicle  engine in compliance with regulations under this subchapter prior to its sale and delivery to the ultimate purchaser, or for any person knowingly to remove or render inoperative any such device.   In Utah Physicians for a Healthy Env't v. Diesel Power, 21 F.4th 1229 (10th Cir. 2021), the court found an automobile dealer that had acquired for resale used vehicles with tampered emission control systems violated the federal Clean Air Act by selling those vehicles with the tampered systems.     Tampering. You may not remove or render inoperative any device or element  of design installed on or in engines/equipment in compliance with the regulations prior to its sale and delivery to the ultimate purchaser. You also may not knowingly remove or render inoperative any such device or element of design after such sale and delivery to the ultimate purchaser.
40 CFR 1068.101

What to Do Immediately After the Light Appears

First 15 Minutes – Freeze the Facts

• Write down the date, time, and mileage when the light or symptom first appeared
• Note the symptom in plain words (misfiring, overheating, stalling, etc.)
• Save screenshots of any online listing or ad claims
• Save all texts, emails, and dealer contact information

Day 1 – Capture Proof

• Get a professional diagnostic scan immediately (shop printout is best; clear photo of the scan screen also helps). Write down the mileage at the time of the scan.
• Do NOT clear codes yourself — this can wipe critical evidence.
• Create a short factual timeline: purchase date/mileage → what you were told at sale → when the issue appeared → dealer response.

Day 2 – Review Paperwork

• Check for an arbitration clause in the contract (it changes your legal path).
• Look for hidden or mismatched fees/add-ons that were not disclosed upfront.

Day 3 – Communicate in Writing

• Email the dealer: Ask for their position in writing (repair, unwind the sale, or deny). Request any pre-sale inspection checklist or repair orders.
• Keep every communication documented — verbal promises mean nothing in court.

Common Mistakes That Weaken Claims

• Waiting weeks to get diagnostics
• Clearing the check engine light yourself
• Continuing to drive an unsafe vehicle
• Relying on verbal conversations only

Tip: Download our full printable checklist (available upon request via the form below).

“As-Is” May Not Eliminate Liability of Dealers Who Conceal Defects

Many buyers are told “it's as-is, you're stuck.” That may not be  true when the dealer misrepresents or conceals problems.  Under the New Jersey Consumer Fraud Act, many courts may find an “as-is” disclaimer cannot shield a dealer who:

• Clears warning lights or codes to hide known defects
• Makes oral promises like “no issues” or “fully inspected” that contradict the true condition
• Fails to disclose material mechanical defects they knew (or should have known) about

Key Court and Regulatory Support

• Cannon v. Cherry Hill Toyota and Cox v. Sears Roebuck & Co. — CFA claims survive “as-is” disclaimers when there is concealment or misrepresentation.
• Leyka Rosario v. NJ Auto Group, LLC (2019) — Court awarded damages and attorney fees under the CFA where a dealer downplayed a flashing check engine light.
• New Jersey Used Car Lemon Law (N.J.S.A. 56:8-67 et seq.) and regulations (N.J.A.C. 13:45A-26B) further prohibit misrepresenting mechanical condition or failing to disclose known defects.

New York Buyers are protected by the Used Car Lemon Law (General Business Law § 198-b), which requires dealers to provide a written warranty on eligible vehicles — “as-is” cannot waive these protections.

Why Choose the Law Office of Howard Gutman

• 25+ years successfully handling auto dealer fraud, concealed defects, and cleared warning light cases in NJ & NY
• Free case evaluations with honest “strong / weak / borderline” assessments
• No recovery = No fee in most cases
• We fight under the New Jersey Consumer Fraud Act, Used Car Lemon Law, and New York protections

Frequently Asked Questions

Q: Does clearing check engine codes before sale prove fraud? A: Not by itself — but combined with the short timeline and proper diagnostics, it strongly supports a concealment claim.

Q: What if my contract says “As-Is”? A: It may nott protect the dealer if they concealed defects or made misrepresentations. We routinely rebut “as-is” disclaimers under the CFA.

Q: How much does it cost to hire you? A: Most cases are handled on a contingency basis — you pay nothing unless we recover money for you.

Q: How long do I have to file a claim? A: Time limits vary for different claims, the law requires return within a reasonable time after sale. 

Call 973 479-5515 for a Free Consultation