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P0420/P0430—The #1 DTC in the Country

DTCs (Diagnostic Trouble Codes) P0420 and P0430 are generic industry codes and part of the OBD-II standards. The descriptor labels the code(s) “Catalytic Converter Efficiency Below Threshold – Bank 1 (or 2)”. And the number one part sold to repair this problem is a...

Troubleshooting Fuel Trim–ASE Practice Questions (VIDEO)

Description 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...

Add or Delete These Simple Parts to Help Customers Save Money

Looking for an easy way to win over your customers that they’ll enjoy every time they drive? Look at their vehicles from a hypermiler’s perspective. In case you haven’t heard the term before, the hypermiling community is obsessed with optimizing their vehicles’ fuel...

Are You Properly Checking Hub Bearings For Wear? (VIDEO)

Description The old “grab the wheel and shake” test you may have used for tapered bearings doesn’t apply for the hub bearings found on most of today’s vehicles. Pete Meier explains how a dial indicator is necessary for a true wear check.Related Videos

Efficiency is the Name of the Game

Someone once told me that successful auto repair is a game of inches. But in our fast-paced, ever-evolving industry, inches are no longer accurate—we need to hit the bullseye every time. Margins are tighter, technology is advancing rapidly, and customer expectations...

Misfire Cause–ASE Practice Questions (VIDEO)

Description Technician A is diagnosing a misfire. He states that a misfire is caused by a fault in the ignition system and that new plugs and coils will repair the problem. Technician B says that a misfire is detected when the ECM detects a variation in crankshaft...

A History of the U.S. Presidential State Car (Part 2)

In Part 1 of this piece, I traced the history of the U.S. presidential state car from the beginning to the Kennedy Lincoln Continental. In this part, I’ll pick up with President Lyndon Baines Johnson’s state car and continue to the present day.1967 Lincoln Continental...

TECHNICIAN CHALLENGE: The Mystery Box, Part 2

TECHNICIAN CHALLENGE: The Mystery Box, Part 2

TECHNICIAN CHALLENGE: The Mystery Box, Part 2 Description The Proving Grounds crew takes on another round The Mystery Box Challenge with new parts and a few new faces. Could you guess these auto parts simply by the way they feel? It’s more difficult than it...
Vehicle weights are increasing. Can your lifts handle it?

Vehicle weights are increasing. Can your lifts handle it?

Average vehicle weights in the United States have steadily increased since the mid 1980s, driven by sustained consumer demand for vehicles with more power, features, and room. Hybrid and electric vehicles can be especially heavy with their batteries and motors,...
The story of the very first reverse gear in an American car

The story of the very first reverse gear in an American car

Making a car go backwards was not the most important part of the automobile’s development, but it sure is important in its operation. In fact, if the average automobile enthusiast was to guess which American-built car had the first reverse gear, he or she would likely...