Shop Press is the news and idea hub for everything related to working on cars and trucks, focusing on repair, technology, and wrenching lifestyle.

From the creative minds at:

FEATURE STORY

Hot Off the Press

When Selling a Job, Get It In Writing (Not an Emoji)

This one’s for anyone who interacts with customers directly: service writers, small shop owners, and even techs who do some moonlighting or side work. Be careful when using text abbreviations, slang, or emojis with your customer, and that goes double when a customer...

The Stories Spark Plugs Have to Tell (VIDEO)

Description In the days of carbureted engines, mechanics would always take a moment to examine the spark plugs they were replacing as part of a routine tune-up. The plugs often provided valuable information as to how well the engine was performing and whether there...

Service Managers: Buy Brake Fluid by the Pint

If you’re in charge of ordering the supplies for your shop, volume discounts are great when they come along. Sniff them out where you can. But brake fluid is different! Buy it in bulk, but buy it in the smallest containers you can get away with. The reason? Brake...

Six Ways to Best Protect Yourself from Keyless Car Theft (For Now)

In 2023, a record number of vehicles were stolen in the United States; 1,020,729 vehicles to be exact. While that number has declined over the past couple of years (850,708 in 2024 and 659,880 in 2025), car thieves haven’t given up. In fact, they’re finding more...

Don’t Forget to Season the Automobiles, Mechanics!

I guess after you watch the following video, you won’t need much commentary. I thought this was common knowledge, but as I’ll explain in a moment, I may be wrong.I thought it necessary because a good friend at an independent repair facility recently bemoaned the fact...

Coolant Service – ASE Practice Question (VIDEO)

Description Technician A and Technician B are discussing proper cooling system maintenance. Technician A says that time and mileage should be considered but are not the only factors to consider when recommending a cooling system service to a customer. Technician B...

What are Frits? (And Why Does Almost Every Car Have Them?)

It’s a pretty safe bet that most younger techs haven’t heard of frits before. Not one single customer, ever, has come into your shop looking for some help with a frit problem. So while this article won’t help you turn bays faster or improve your diagnostic skills,...

Cat DTC Diagnosis (P0420) – ASE Practice Question (VIDEO)

Description Technician A and Technician B are discussing the troubleshooting procedure for a P0420 (Catalyst Efficiency Below Threshold) DTC. Technician A says that the presence of any other codes should be considered first before replacing the converter. Technician B...

Mechanics React: Can you diagnose a vehicle’s problem just from the sound? (VIDEO)

Shifting Gears

by Lemmy | Jul 5, 2022 | 0 comments

Description

Nick and Lemmy, Dorman employees and mechanics, took a gander at a few internet videos and did their best at diagnosing via the Internet. The results were humorous, if lacking in accuracy. Do us a favor and take it easy on them in the comments—these guys can’t agree with each other, never mind being agreeable with their colleagues at Shop Press. Without further ado, here’s the Diagnostic Duo in their glory.

This Tool Makes Fuel Line Repairs So Much Easier (VIDEO)

Quick disconnect tools are a must for modern fuel, A/C, or transmission line jobs; no more fighting clips.

May 12, 2026 0

The Real Meanings Behind OBD-II Diagnostic Trouble Codes (VIDEO)

By breaking down the structures used to create DTCs, you can learn how to “decode” beyond the simple descriptions presented by a scanner.

Sep 30, 2025 0

Interpreting Compression Tests–ASE Practice Questions (VIDEO)

Technician A completed a compression test, noting high readings suggest an exhaust restriction, while Technician B says the test checks volumetric efficiency.

Aug 26, 2025 0

When a Voltmeter Isn’t Enough (Video)

Many high-end scan tools come with a capable digital storage oscilloscope. Time to put that tool to work.

Aug 7, 2025 0

Troubleshooting Fuel Trim–ASE Practice Questions (VIDEO)

Technician A and Technician B are discussing ways to use fuel trim as a troubleshooting aid. Technician A says that fuel trims that are correcting for a lean condition at high RPM and load conditions indicates a problem in fuel delivery. Technician B says that this condition is caused by a vacuum leak.

Jul 29, 2025 0

The articles and other content contained on this site may contain links to third party websites. By clicking them, you consent to Dorman’s Website Use Agreement.

Shop Press Comment Policy

Participation in this forum is subject to Dorman’s Website Terms & Conditions. Please read our Comment Policy before commenting.