Bumper to Bumper Radio, the car guys on KTAR, 92.3 FM in Phoenix, AZ, broadcast every Saturday from 11:00 am to noon. On this show, Dave Riccio of Tri-City Transmission in Tempe, AZ and Matt Allen of Virginia Auto Service in Phoenix, AZ talk about the advantages of paying for a computer auto diagnostic before your repair. Special guests includes Dave Denmin of Dave's Car Care. Also on this show:

• You can ask shops to waive the diagnostic fee if you let them do the repair.
•  Independents versus dealerships.
• Getting and accurate diagnostic will save you money.
• 2013 Jeep Grand Cherokee with 3000 miles. Have replaced the battery, alternator, and range motion transmission sensor. The cause was a ground wire that was loose. Could this cause more damage?
• What is the best aftermarket scanner?
• 2004 Toyota Sequoia with 130,000 miles. First two sets of breaks lasted 50,000 miles. Third set lasted 25,000 miles. Dashboard now lights up when I hit the breaks.
• 1997 Mercury Villager with 217,444 miles. As I pick up speed, the car doesn't shift up smoothly.
• 2005 Nissan Titan with 150,000 miles. Has an exhaust leak. Do I need to get that fixed?
• 1999 Toyota 4 Runner. Stutters when accelerating. Seems to do this more in the morning and at higher speeds.
• Are automotive service coupons a scam?
• 2013 Chevrolet Sonic. Running rough and have been told to use premium gas.
• 2008 Chevrolet Tahoe with 35,000 mile. What service should I have now.
• 2001 C70 Volvo. Who would you recommend to service this car?

Cars talked about on this show are the 2013 Jeep Grand Cherokee, 2004 Toyota Sequoia, 1997 Mercury Villager, 2005 Nissan Titan, 1999 Toyota 4 Runner, 2013 Chevrolet Sonic, Chevrolet Tahoe, 2001 C70 Volvo.