The Danger of Tunnel Vision in Automotive Diagnostics: Anchoring, Confirmation Bias, and Premature Closure [E243]

The Danger of Tunnel Vision in Automotive Diagnostics: Anchoring, Confirmation Bias, and Premature Closure [E243]

From Diagnosing the Aftermarket A to Z by Matt Fanslow

July 1, 2026 · 31 min · Episode 243

About this episode

Matt discusses the dangers of diagnostic tunnel vision in automotive repair, using a case study of a Dodge Durango to illustrate the risks of anchoring and confirmation bias.

Thanks to our Partners, Pico Technology, and Autel Watch Full Video Episode A Dodge Durango came into the shop for a second opinion after being suspected of needing a transmission. The symptoms sounded convincing at first: harsh shifts, apparent slipping, no diagnostic trouble codes, and a vehicle that felt completely wrong on the road. But the actual problem was much simpler. The Durango was stuck in four-low. Once shifted properly through neutral, the harsh shifting, driveline bind, and “slipping” behavior disappeared. Matt uses the case as a springboard into a broader discussion about diagnostic tunnel vision. The point is not just that someone almost condemned a transmission unnecessarily. The deeper issue is how easily a first impression can become the diagnosis. Once the vehicle felt like it was slipping, everything after that could be interpreted through that lens. That is where anchoring, confirmation bias, and premature closure start to become dangerous. The episode also compares the Durango case to a more common misfire scenario. A vehicle comes in with a misfire, the scan tool identifies a cylinder, the car line is known for coil failures, and the diagnosis becomes a…

People in this episode

Host: Matt Fanslow

Topics covered

Sponsors

Pico Technology, Autel

Mentioned in this episode

Places: Dodge Durango, Mini Cooper

More episodes of Diagnosing the Aftermarket A to Z

Explore listener stats, chart rankings, contacts and more on the Diagnosing the Aftermarket A to Z podcast page.