Engine Repair Diagnostics

The Check Engine Light offers no explanation and can be one of the most confusing warnings in your dashboard. It can be as serious as a malfunctioning catalytic converter or as trivial as a loose gas cap.

OEM quality or OEM exact parts are used in repairs for most driveability and tune-up issues. Our technical staff has over 25 accreditations from the factory and aftermarket industry; that includes everything from computer control systems to full engine mechanical operations.

If the Check Engine Light comes on it can be for a number of reasons, the most common are:

  • Loose or damaged gas cap
    If the gas cap is loose, a quick tighten could easily solve your problem. If it is damaged, then a replacement is needed.
  • Faulty oxygen sensor
    A proper diagnosis is best. Deterioration of the precious metals inside the catalytic converter affects the sensors’ ability to give an accurate reading. Neglecting the issue can eventually damage your catalytic converter and the engine itself.
  • Failing catalytic converter
    Generally speaking, a catalytic converter will not fail if you properly maintain your car. A failing converter can be the result of a failing ignition system or another engine efficacy issue.
  • Faulty mass airflow sensor
    Have your air filter checked and replaced on a yearly basis. It is possible to drive for months with a malfunctioning mass airflow sensor. This is a bad idea; as your gas mileage will drop and the vehicle will start becoming less efficient and consume more fuel.
  • Bad spark plugs and wires
    While newer cars can go up to 100,000 km on a set of plugs, older vehicles, (especially those built before 1996,) could require new plugs roughly every 60,000-80,000 km. We can make quick work of the job and new plugs in most cases are very reasonable.

What to expect:

During the inspection, your car’s monitoring system will have “fault codes”, that indicate the nature of the problem. The technician will provide a detailed report that describes the diagnosis. You will then be contacted with the necessary repairs and an estimate prior to work commencing.

Please note: It may take several days of driving the car for the monitoring system to verify that the repair has fixed all the issues.

Is your engine light on or blinking?

Engine light on: the situation is usually not an emergency. You can continue driving, but you should schedule an appointment as soon as possible.

Engine light blinking: The situation is usually serious and you should  stop the vehicle and have it towed to us right away. 

Call Macleod Auto & Truck Repair. We will arrange with CAA/AMA or a private tow company to get your vehicle to us for a proper diagnostic inspection and repair. Don’t forget your CAA/AMA card for your rewards points. 



Electrical Diagnostics & Drivability

Engine Repair & Diagnostics

HVAC (Heating, ventilation & cooling)

Lube, Oil & Filter

Suspension, sterring & alignment

Starting & charging systems & battery needs

Transmission & Driveline

Tire & Tire Repair