Wells adds to video case studies

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The technical services team at Wells Vehicle Electronics has released two in-depth video case studies covering mass air flow (MAF) and variable valve timing (VVT) diagnostics.

Available in English and Spanish languages, the new videos join more than 40 other free diagnostic case studies available through the company’s website and “WellsTech” YouTube channel.

Produced in the company’s diagnostic repair lab and media tech garage in Fond Du Lac, Wis., the new videos are:

P0171 Mass Air Flow Diagnostics

This six-minute video features a 2002 Buick LeSabre equipped with a V6 engine. The owner had reported declines in power and fuel efficiency and the “Check Engine” light was illuminated. Based on the stored trouble code – P0171 – the WellsTech diagnostician isolated the problem from a wide range of possibilities, including faulty MAF sensor, vacuum leak, restricted injector, low fuel pressure, malfunctioning oxygen sensor and plugged PCV valve. Tools used in the diagnosis were a lab scope (to check MAF and throttle position sensor signals) and scan tool.

P0014 and P0306 Variable Valve Timing Diagnostics

The subject vehicle, a 2002 Chevrolet Trailblazer, exhibited a variety of drivability symptoms, including loss of power, reduced fuel efficiency and rough idle. Two trouble codes – P0014, indicating a cam phasing error; and P0306, cylinder 6 misfire – had been stored. The diagnostic process included testing, removing and inspecting the variable cam timing solenoid and analyzing current draw to the cylinder. The WellsTech diagnostician used a scan tool and lab scope in identifying the root cause.

Researched, written and produced entirely in-house by the Wells Technical Services team, each Wells video case study tackles a complex diagnostic challenge commonly encountered in automotive service facilities. The point of each segment is to help the technician complete a thorough and accurate diagnosis in the most efficient and effective manner possible. The videos have attracted more than 5.8 million views and 10,500 subscribers through multiple YouTube channels.

“The popularity of our videos demonstrates the demand among technicians for information that can help them save time in accurately diagnosing and repairing drivability issues. There is no product promotion or selling – our sole mission is to help the viewer find and fix the problem through the use of easily accessible tools and proven diagnostic procedures,” says John Zochert, director of marketing and product management for Wells Vehicle Electronics.

To access the entire video library, click on the “WellsTech” tab at and select “on-car how-to videos” or visit the “WellsTech” channel at

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