Acura Check Engine Light On Troubleshoot Guide

Acura Check Engine Light On Troubleshoot Guide

Does a Check Engine Light illuminate your Acura Dashboard? Check engine light on an Acura can come on for a number of reasons including faulty spark plugs, bad catalytic converter, bad ignition coils, extremely dirty engine air filter, and even a loose gas cap.

To find out why your Acura check engine light is on, you will need an inexpensive OBD2 scanner that can read and clear the codes after you fix the problem. In this article, we take a look at the common problem, symptoms, and how to read Acura engine codes yourself.


Common symptoms that Acura owners notice when CEL comes on are:

  • Engine Missifre
  • Car Shakes
  • Poor Acceleration
  • Variable Torque Management VTM-4 Light On
  • Check engine light flashing on and off
  • Check the engine light, and TCS comes on
  • Check engine light blinking

What does the Acura check engine light mean?


Acura check engine light (CEL) turns on to let you know that the engine control unit (ECU) has detected a problem. A fault code is stored in the Engine Control Unit (ECU) and can be retrieved with an OBD-II scanner, as shown below.

When your Acura check engine light remains on, the problem could be something as simple as a loose gas cap. It can also indicate a serious engine issue, a problem with the emission system, or in some cases, even an indication of a problem with the automatic transmission.

What problems trigger the check engine light on an Acura?

acura engine

While many possible problems will trigger the Acura check engine light, you will find some of the most common problems below.

  1. Worn spark plugs
  2. Defective Ignition Coil
  3. Bad Mass Air Flow Sensor
  4. Oxygen Sensor
  5. Catalytic Converter
  6. Loose Gas Cap
  7. Crankshaft Position Sensor
  8. Bad thermostat
  9. A defective coolant temperature sensor
  10. EVAP issue

Why is Acura Check Engine Light Flashing On and Off?


If your Acura check engine light is blinking, it usually means there is an engine misfire.

Fuel is not getting burned in the cylinder. In such cases, the engine will also shake noticeably.

Do not drive an Acura for an extended time if the check engine light is flashing. Driving with the check engine light blinking increases the risk of causing damage to the engine.

How to Diagnose and Reset Acura Check Engine Light

You need to read the codes to understand why the ACURA check engine light is on. This is a simple procedure you can perform using an OBD-II scanner.

If you want a more professional scanner that can read all control modules of your Acura vehicle, use the YOUCANIC Full System Scanner, which runs through every control module on an Acura and supports all make and models.

Best Scanner Acura YOUCANIC UCAN2

What You Need

A basic OBD-II Scanner that can read and clear check engine fault codes from the Engine Control Unit.


The following procedure will allow you to read codes and reset the check engine light on Acura cars.

  1. Locate OBD-II Port under the dashboard on the driver’s side. This is a 16-pin port. All 1996 and newer ACURA vehicles have this port under the dashboard.


    Plugin your handheld scanner into the OBD-II port.

  2. Turn the key to position II. All the dashboard lights will turn on. Do not start the engine. If your ACURA has a Start/Stop button, you must press the Start button without pressing the brakes.How- to-diagnose-ACURA-check-engine-light-service-engine-soon
  3. Allow the OBD-II scanner to turn on and connect to your ACURA Engine Control Unit (ECU).
    PXL 20220312 003004456
  4. Read Codes. Read ACURA check engine light codes from the Engine Control Unit (ECU) using your OBD-II scanner.

Write down the codes and research the problem before you replace any parts. Once you fix the problems you found, come back to the main menu, and instead of Reading Codes, choose Clear Codes and press OK.

What does it mean when Acura checks the engine light flashes five times?

Acura check engine light may flash five times when you turn the key to position II but don’t start the car. This happens when the fault codes are cleared with an OBD-II scanner or if the battery is disconnected.

  • It means that the emission systems are not checked by the ECU self-test, also known as the emission readiness test.
  • After a few driving cycles (usually within a week), emission readiness (I/M) is complete, and you can pass the emissions test.
  • If the Acura light is flashing five times, you won’t pass a state emission test until the emission readiness test is completed.
  • Drive the vehicle for a few days, and your Acura check engine light should stop blinking once the I/M test is complete.

We hope you find the Acura Check Engine Light On Troubleshoot Guide helpful. Check these troubleshooting and repair guides for more help on your Acura.


  • Rushit Hila • ASE Certified

    Rushit Hila, an ASE-certified engineer (G1 Automotive Maintenance and Repair), brings over two decades of hands-on experience in the automotive world to his writing. With a strong educational background, including a Master of Science in Engineering and a Bachelor of Science in Engineering, he has honed his skills and expertise through years of practical work. As a respected authority in the field, Mr. Hila is dedicated to offering insightful and valuable content that resonates with both vehicle owners and mechanics.

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  1. Anonymous says:

    I have a 2012 RDX and my check emission system came on. I went to several Auto zones and O’Reilly’s. Auto Zone could not get a code and the first time I went to O’Reilly’s that stated my turbo was misfiring. I had my spark plugs and air filter changed and when I went back to get the code. It showed 41-6, 77-1, and 86-1. The sales man stated it is no giving him codes and that he is not sure what the numbers are. I changed my battery as well and the check engine did blink 5 times.

  2. Anonymous says:

    My 2012 Acura TSX special edition 6 speed check engine light flashes when I’m in 5th or 6th going over 3200 rpms, I recently got the timing chain replaced and the timing is fine. Before I was getting random cylinder misfire codes and now I plug in the scan tool and I get no codes just want to know if anybody has ran into this issue. Fuel injectors have been replaced spark plugs are new coil packs are new

    1. Anonymous says:

      (No subject)
      Valve adjustment