Also had smog test. In and out about an hour. Great professional service and friendly. Great value.

Always quick and very professional, easy to talk to and hardly trys the upsell game at all. They are very good people and will treat you right every time.

Im going here from now on, they did more for my car then the dealership. Plus cost me half the price as the dealership and I got more work done. Thank you so much.

Jeff is great! Very helpful and goes above and beyond to make customers happy

Gary and his crew are great. Tremendous knowledge base across cars and trucks. Will always give you a straight story and not just a sales pitch. They always stand behind their work. People come from the Tri-Valley because they know that they will get a good job at a fair price and not be oversold for things they do not need.

Gary was always professional and always did a great job. Havent used them in years after I moved out of Hayward. Glad to see he is still doing well.

Had a train horn installed with a tank and compressor. They had absolutely amazing customer service and I will definitely be returning to get other things done that I cant do myself.

Wonderful and courteous service.

Top notch mechanics. They stand behind their work.

So glad I found a shop that knows how to properly diagnose and fix my vintage cars when others turned me away! 😁

Great place to get your car worked on. See jeff or Gary there. Very knowledgeable and such great people

I have known Gary and his staff are many years they do nothing but exceptional work and I would highly recommend them to anyone looking for an honest Deal and excellent work

I brought my toyota siena here for turning off while riding,It is been already 2 months plus as bd still not ready.The first time they called me to pick it up because it was done, I paid 1600For the repair which they never told me before the estimate.But it was going to be to late to discuss the priceIf it was done.So I paid without making issues.The second day o drove it for a little longer drive it broke down on the freeway for three same exact reason, just turned off.I had to call AAA to bring it to my house.I took it back to the guaranteed auto again.They said we will take care.Well they called me later on after 2 or 3 weeksSaying it was ready and guess what,?I drive again and dumped me again.The same issue.I took it back again and still not a phone call yet to come and pick it up.It Id been almost 3 months since I took it for first time, luckily I have a second car to use.Well I hope the owner reads this reviewBecause I am coming to them this coming weekTo pick up my car and my whole 1600 hundredDollars, and if they dont give me my money backI will sue the them un the small claims court.It was a one start because 0 is not an option.

The most honest mechanic Ive ever found, and thats saying a lot!My highest recommendation.We have been coming here for nearly 10 years now, and will be coming for all future needs as well.Gary and Jeff and all their crew will tell you if your vehicle needs something expensive, something cheap, or in-between, and whether its safe to wait or needs attention immediately.They are friendly, courteous and helpful, and above all else they treat others as they would like to be treated.Id happily send a non-savvy elder or teen here, without foreknowledge of the issue.Id recommend this shop to family and friends (and I _do_, at every opportunity!).No holds barred - this is a safe, efficient and *skilled* place for vehicle repair and maintenance.You will never regret choosing this shop.Please feel free to PM me with any questions about my experiences here.ianto.jones [at] me [dot] com - plaintext only, no URLs.Thanks !

Ive taken our cars to Guaranteed Auto for years and have always found Gary and his staff to be dependable, honest, friendly, and very knowledgeable. Exactly what every car owner hopes for in a mechanic.

Love this place only person I trust working on my cars mr. Guaranteed Gary himself

They know what theyre doing and they know how to fix it. Ive had no priblems getting my car(s) repaired or serviced here

All I did was ask Jeff for a Quote on installing a part Cold Air Intake I bought from Oriellys. Did I know that i was an idiot for asking for a quote for an outside part, well I do now........BRO as he called me...like in other words idiot...ok...Thanks BRO!Sounded like just another arrogant mechanic, make sure you know everything before you call them especially if Jeff answers the phone.My 1 star is because a 0 is not an Option....BRO!

Trust worthy. Good people.

Excellent, professional, honest guys. They care and you can tell.