Check Engine Light

CHECK ENGINE LIGHT

So there’s something not quite right about the way your vehicle is driving, or you’ve got a warning light on your dashboard that was blinking at you yesterday and now it is on steady. What do you do? Hint: the answer is not to put a piece of electrical tape over the warning light and ignore it.

What makes a warning light come on?

Modern vehicles have complex systems monitored by on-board computers. When a system or component operates outside its normal range, the computer detects it and triggers a warning light to alert you.

A check warning light can be triggered by anything from a loose gas cap to engine, transmission, or brake issues. Even if your car seems to be driving fine, ignoring warning lights can lead to serious problems or safety hazards. It’s best to have your car checked by a certified professional as soon as possible for peace of mind.

How can Dave’s Auto Center
“diagnose” my problem?

1. RETRIEVE DATA

 A full functioning scan tool is used to perform an onboard computer system analysis in order to retrieve the following:

  • Computer codes
  • Freeze frame data
  • Computer software version numbers
  • Critical sensor data and status information

2. VERIFICATION TESTING 

Verification tests determine if systems meet proper specifications. These tests may include an analysis of:

  • Engine vacuum and backpressure
  • Mechanical and electrical engine timing
  • Ignition system
  • Fuel system
  • Emissions system

3. PINPOINT TESTING 

All manufacturers require that circuit or component pinpoint testing is done in order to make an absolute diagnostic determination. These actions involve:

  • Working through wiring diagrams
  • Performing electrical and/or mechanical tests
  • Performing bi-directional control tests
  • Visual inspections of suspect areas

4. RESEARCH TECHNICAL SERVICE BULLETINS

Technical Service Bulletins and hotline information will indicate if the problem has been determined to be a pattern failure, meaning that it is a known issue that occurs with a particular type of vehicle. This does not eliminaCHECK ENGINE LIGHTte the need for testing, as other systems must meet specifications before a service bulletin procedure should be performed.

5. CAR REPAIR

This may involve multiple actions such as:

  • Parts replacement
  • Cleaning of passages, connections and/or components
  • Performing manufacturer technical service bulletin updates
  • Updating of vehicle’s computer software
  • Wiring repair or replacement

6. VERIFY REPAIR

Once all necessary actions have been taken, the vehicle must be retested to verify that the repair is complete and has achieved the proper results.

Frequently asked questions

Can I just get my codes read at a parts store for free?

Parts stores often offer basic code reading, but that only gives you a starting point. It doesn’t tell you what’s actually wrong or how to fix it. Our certified technicians perform full-system diagnostics, not guesswork.

It could be something as simple as a loose gas cap, or more serious like a faulty oxygen sensor, failing catalytic converter, transmission issue, or fuel system malfunction. That’s why a thorough inspection is crucial.

If the light is steady, it may be okay to drive short distances—but it should be diagnosed soon. If it’s flashing, it indicates a serious issue (like a misfire) that can damage the engine. In that case, pull over and call us.

We use professional scan tools to retrieve codes, freeze frame data, and system info. Then we perform verification testing, pinpoint diagnostics, technical service bulletin research, and repairs, followed by a retest to confirm the fix.

Yes. Ignoring the light can lead to worsening performance, poor fuel economy, and even expensive engine damage. Addressing the issue early is always the best move.

Have more questions?

If you’re still seeking answers, don’t hesitate to reach out to us. Our team is here to assist you with any inquiries you might have.

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