Freeman Alignment
“They even let me know wheel bearing would need to replaced in future.”
Best Car Tune-Up in Janesville, WI
15 technicians listed · 5 in Janesville · 6 open weekends · 14 rated 4.5+
Data verified October 20, 2026
PS Auto Glass / Maxxed Out Motorsports
“Marshall was quick, did quality work, and was very good at translating what he saw and what he thought about it into information that made sense to the layperson.”
K W Truck Auto Repair
“Great service great mechanic solid work I've been going there for thirty years”
Rock Diesel
“Very helpful have helped me with anything I have had to get help with.”
CTR Automotive Service South
“I have heard from more customers than I can count that CTR South took good care of them, were respectful, and honest.”
Street Performance Mufflers & Brakes
“Brought my 2020 Lamborghini Aventador SVJ for a custom exhaust install and left me speechless on how quick, careful they were.”
Listed for drivers in and around Janesville, WI, these 15 shops handle tune-up work and running faults. What each one says about diagnostics, warranties and service specials comes from its own website; ratings and quotes come from public reviews.
Area overview: Janesville, WI
Of the 15 technicians we list here, 5 are in Janesville itself and 10 come from towns including South Beloit, IL (4, 13 mi), Beloit (3, 10 mi) and Afton (1, 7 mi). The technicians on this page are rated from 4.3 to 5.0 across 647 reviews; 4 have 50 or more reviews and 14 are rated 4.5 or higher. The topics that come up most in reviews of the technicians on this page are "price", "fair" and "honest". 6 are open on Saturdays. 2 have a BBB rating of A or A+. Domain records put 3 websites of the technicians on this page at ten or more years old; the oldest dates from 2011. 1 gives free estimates and 2 are family- or locally-owned. We have a website on file for 7 of the technicians on this page; 6 publish a contact page and 5 list a public email. We count these figures across the technicians on this page; distances are straight-line, and hours and prices change, so confirm the details with the technician before you visit.
Which shops listed for Janesville open on Saturdays or Sundays?
6 of the 15 shops here show Saturday or Sunday hours. Plugs and filters fit neatly into a Saturday. A chase for an intermittent misfire does not, since it can need the car overnight to catch the fault happening from cold.
High Velocity Diesel Performance
“Made my fourth of July weekend plans with my children possible by going above and beyond with the repairs needed.”
Road Medic
“I will be using his service in the future when I have problems with my vehicle.”
De-Denter Shop
“Repairs are done very quickly and if it needs to take longer, he often has a loaner car available if needed.”
Ace Auto Sales & Mechanic
“They have literally saved us thousands of dollars after getting quotes from other mechanics.”
Real's Auto Repair
“I had my truck there twice in the last 2 years with challenging problems & they were fixed each time!”
DC Auto Repair & Towing Service
“They replaced the exhaust manifolds (very difficult job) in a timely and price effective way.”
South Beloit Lube
“Appreciate Andrew and his guys…thank you again”
C & G Auto Repair
S & H Automotive
“They got me in right away to check out my clutch.”
Why these companies made our list
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