French: The $400 Air Filter: Why Your MPI Process is Restricting Profit

Once upon a time, a loyal customer named Shelby spent over $400 at her local auto shop for a single misdiagnosis.

Shelby was the ideal customer—she believed in supporting local small businesses and took meticulous care of her car. When her maintenance reminder light came on, she headed straight to her go-to garage. The technician performed the oil change and a multipoint inspection (MPI), which the service advisor returned with a clean bill of health. Every box was checked off green. Shelby left with the good news, assuming her car was in great shape.

A few weeks later, the first heatwave of the season hit. Shelby turned on her AC, only to find the airflow struggling and a strange noise humming behind her dashboard. She returned to the shop and authorized an hour of diagnostic time, plus a refrigerant evacuation and recharge that was prescribed by the service advisor—a $400 repair order. The same technician pulled it into the bay. After following the diagnostic trouble chart and recharging the system, he found the AC was technically operating as designed, yet the problem still persisted. 

Finally, he checked the one thing that he didn’t check on the last inspection—the cabin air filter.

When he pulled it out of the glove box area, it looked less like a filter and more like a “Tribble” from Star Trek. It was so restricted, it was suffocating the system. How uncomfortable is that phone call? How do you tell a loyal client that they just paid $400 to find a part that should have been caught and replaced for $30 weeks ago? That is how you lose trust. And in our industry, trust is the most valuable currency. 

This story isn’t an anomaly; it happens every day. This month, this column is focusing on operations and profitability. MPIs are the bread and butter of the service department, but they only work if they are a priority in your shop. To stop hemorrhaging opportunities, you have to focus on three things: 

1.Train for rhythm, not just speed. I’ve met many technicians who were never properly taught how to perform an MPI. They were usually rushed through onboarding and expected to “just know” what to do. Without a mentor or foreman to help them find a rhythm, they missed critical safety concerns and profitable repairs. Invest in the reps. Have your entry-level technicians perform inspections under supervision until it becomes muscle memory. When a tech feels confident, they pick up speed and accuracy. Create a physical path on the car that the tech can memorize the steps (start at the front door, work your way to interior safety features, then tires, then suspension/exhaust, etc.). This habit also will reduce the amount of potentially missed items (like cabin filters). 

2. Bridge the communication gap. Technicians often despise inspections because they feel like they’re a waste of time. It’s understandable to feel frustrated when they take the time to prepare the inspection only to find out that the recommended services/flushes weren’t sold. We have to show technicians that an MPI is an investment in their future flag time. By documenting the “yellow” or “red” items now, they are planting the seeds for bigger jobs down the road. Data proves that technicians who thoroughly and consistently inspect vehicles have higher average flag hours per RO than technicians who don’t. Additionally, they need to understand that they have become the customer’s safety net. The MPI isn’t just a sales estimate, it’s a bill of health. When safety is understood, attention to detail increases—especially when they are car seats in the back seat. Finally, when the advisor sells the recommended work—share the win with the technician! Consistent, positive reinforcement is going to bridge the gap between the front and back of the house, but it will also help ultimately change the tech’s mindset about MPIs.
 
3. Simplify the sheet. Is your inspection 25 points or 120? If it’s too long, the technician will “pencil wrench” it. If it’s too short, you’ll miss the “Tribble” in the dashboard. Keep your inspection intentional. It needs to cover the essentials:

• Tires: DOT date code, pressure, TPMS operation, visual inspection for potential road debris/dry rot. Don’t forget to check the spare!
• Fluids: Are they low or contaminated? Utilize fluid test strips as another visual aid for the client.
• Brakes: Measure pad thickness, inspect rotor or drum integrity, and take pictures of the main components that may be hard to see for the customer.
• Suspension: Visual inspection of components, shakedown/bounce method, checking for ball joint play.
• Exhaust: Visual inspection for perforation/rot, shake test for proper mounting.
• Batteries: Check battery state of charge and identify if the vehicle has multiple batteries or an auxiliary battery. The aux battery is the most overlooked item in the starting/charging system.
• Lamps: Visual inspection of lamps, identify if there are cracks or potential moisture intrusion inside assemblies. If the headlamps are yellowed or aged, recommend a restoration kit.
• Belts and hoses: Check belts and hoses for cracks, dry rot, contamination, swelling, leaks, etc.
• Safety features: Check horn, wipers, and mirrors for proper operation. Check for any warning lights on the dashboard—don’t diagnose at this time, inspect only. 

Tech tip: in addition to completing the MPI, make sure that the technician also looks up and reviews the customer’s vehicle maintenance schedule from the factory. A lot of clients don’t even know that they have one within their owner’s manual. Checking the schedule and educating your customer about its existence will also build trust!

Once the technician hands off the MPI, the service advisor takes the stage. To build trust, advisors need to be master translators. Don’t just plop a list of repairs on the customer. Break them down into “Now, Soon, and Later.” 

• Now: Safety-related or critical repairs that significantly affect the integrity of the vehicle.
• Soon: Items wearing down (like brake pads) that still have some time left.
• Later: Items that can be budgeted for and scheduled at their convenience (flushes, accessories, etc.).

Get the client involved. If your shop allows it, bring them back to the bay for show and tell. Use visual aids—like desk mats showing suspension diagrams or AC components to break down the technical barrier. When a customer understands the “why” they don’t feel like they are being sold—they feel like you’re genuinely working in their best interest.

A “fluffed” MPI cost Shelby $400 and cost the shop a reputation. A great inspection, however, benefits everyone: the customer stays safe, the tech flags more hours, and the business grows. Everybody wins. 

If your MPI process is broken, your profitability is leaking through the cracks. Take a look at your shop today. Are your technicians trained on inspections? Is your sheet intentional? Are your advisors translating technical terms into a way that makes sense to the client? If not, it’s time to shake things up and refocus. At the end of the day, we aren’t just fixing cars, we’re taking care of our community and keeping people safe. People like Shelby deserve an auto repair shop that catches the “Tribbles” before they become $400 problems.