10 Car Repairs You’ve Probably Wasted Money On

Car repair and maintenance is essential to the safe, efficient operation of your vehicle. Don't skimp or delay on important work that needs to be done. But, be aware that some of the work your mechanic suggests, or that you do just because you've always done it, may be a waste of money.

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Family Handyman

Cabin air (and other) filter replacement

Cars are full of filters. Some are more important than others, but each represents an opportunity for you to save money by doing the replacement yourself. A great example is the cabin air filter. Generally accessed through the glove compartment, its main purpose is to improve air quality inside the car. Most service manuals recommend replacing it annually. A car repair shop will charge you as much as $70. Don't waste the money—do it yourself. Just be sure to buy the right filter for your car's make and model.

Learn how to replace your cabin air filter the proper way!

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change spark plugsFamily Handyman

Regular engine tune-ups

If your car was built in the last 10 or 20 years, it does not need regular tune-ups as cars did decades ago. Modern on-board computers make adjustments to ratios and settings that optimize your engine performance. If the engine seems to be running poorly, a tune-up could cure it, but it's likely a specific problem that you can fix yourself if you wish, such as replacing spark plugs.

Here’s what you should know before you attempt to replace spark plugs.

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Mechanic-with-grease-gun-.-Auto-repair-shop-serviceGTS Productions/Shutterstock

The lube job

The chassis on a modern car, including the ball joint, is almost always lubricated in a closed, sealed system. Some heavier duty vehicles, like full-size pickups, may still require occasional lubrication of the undercarriage. Check your owner's manual before you fork over money for an unneeded lube job.

These are the car problems you can diagnose and fix yourself.

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fh12may_528_13_051 car engine coolantFamily Handyman

Coolant (antifreeze) flush

A coolant flush with a cleansing, flushing product can cause more problems than it prevents by removing any normal-level contaminants in the coolant system. Seals can be damaged, leaks can spring. So, unless you drive in unusually dirty or dusty conditions, simply draining and replacing the coolant yourself should suffice. Even with newer coolant products that boast a 100,000-mile lifetime, most vehicles will need to have the coolant refreshed from time to time.

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Young-Hispanic-mechanic-draining-engine-oil-from-a-car-for-an-oil-change-at-an-auto-shopantoniodiaz/Shutterstock

The 5,000-kilometre oil change

Whether you do the work yourself (usually not worth the savings) or bring your car in for service, most experts agree that we change our engine oil more frequently than is necessary. Engines and lubricants have changed. If you check your owner's manual, you may find that it suggests an oil change every 8,000 or even 16,000 kilometres, not the 5,000 kilometres indicated by the sticker put on your windshield at the service station or dealership.

Learn more about high-mileage motor oil and filters.

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car-InjectorsAlxCreate/Shutterstock

Cleaning Fuel Injectors

The build-up of carbon and deposits on your fuel injectors is a problem that needs to be addressed, but these days it's a rare situation that demands a professional cleaning. Fuel injectors in newer cars have been improved and are less likely to get gummed up than they were a few years ago. Plus, the nature and amounts of detergent required in gasoline has increased at the same time, providing greater protection to fuel injectors. If your car is stalling or sluggish, try upgrading to a top-line gasoline with better detergents for a couple of tankfuls.

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Measuring-tire-depth-using-a-small-coinwk1003mike/Shutterstock

Replacing a Single Tire Is OK

Tires don't usually go flat in pairs, but the salesperson at the tire store will tell you that you need to buy them that way. Or maybe even all four! Dire consequences may result if you throw off the balance with a single new tire, you'll be told. Not true. But, if the remaining tire on the opposite side of the one being replaced has less than 75 per cent of its tread, think about a twofer (both front tires or both back). It's a good idea to have four tires that are the same make and size.

Here's what you can do to extend the life of your tires.

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Worn tireFamily Handyman

The Front-End Alignment

You don't need to haul your car in for front-end alignment service every time you hit a pothole. If the steering is noticeably pulling, look into it. If you really need a front-end alignment, you will know. Misalignment can cause uneven tire wear, as seen in the cutaway photo above. But, understand that the adjustment will only last until you hit the next pothole.

Find out when you should switch to winter tires.

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Switched-on-conditioner-with-flow-of-cold-air-in-carAfrica Studio/Shutterstock

Air Conditioner Recharge

If the air conditioning in your car is not as cold as it used to be, it might be time for a recharge of the refrigerant. But, probably not. Modern car AC systems are tightly sealed and most don't ever experience a loss of refrigerant. More likely causes are the blower fan or leaks in the air circulation system. Have those checked first before you spend $200 to $300 on a recharge.

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Mechanician-changing-car-wheel-in-auto-repair-shopMinerva Studio/Shutterstock

Tire Balancing and Rotation

When you buy new tires, they need to be balanced by the installer. Beyond that, it is not necessary to pay someone to do the job unless you notice an obvious handling problem. Tire rotation, however, is a good idea every 5,000 to 6,000 miles to even out tread wear, especially if you have a front-wheel drive vehicle, where the front tire treads wear out about three times as fast as the rears.

Find out how to get better fuel economy from your car.

Originally Published on The Family Handyman