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    Diagnosis and Services

    4.4 (9 reviews)
    Closed 8:00 am - 5:00 pm

    Services - Diagnosis and Services

    Auto maintenance

    Auto fluids and filters maintenance

    Oil changes

    4 More Services

    Auto repairs

    Auto transmission repair

    Routine automotive maintenance

    Transmission leak inspection

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    Yvonne J.

    Disappointed that there was shoddy workmanship on my sons Mercedes. His grandmother gave it to him prior to leaving for US Marine Bootcamp. We spent over $4000 to have the car spruced up for him and the second time he drove it, a hose got cut by the alternator fan that they replaced. It was not clamped down! We took pictures of the problem and tried to show Luis, he said my son should have been watching the gauge for signs of overheating. The car stopped on the 210 freeway, thank goodness my son wasn't hurt! I usually do not leave Yelp reviews but I feel obligated to speak up so this doesn't happen to others. I don't mind spending a little more money for good work and be assured that the car is safe, but this was not the case in this instance! This was a $20 piece of equipment (the hose and clamp)that could have been replaced and would have avoided a major problem. Now the engine is blown and my son who is only on leave for 10 days does not have a car! So disappointed and disheartened. Please think twice before spending your money and trusting this facility.

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    6 years ago

    Helpful 7
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    Love this 6
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    4 years ago

    Helpful 1
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    5 years ago

    Came for an oil change for 4series. Good fast honest reliable service. Will be back for more service when needed.

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    8 years ago

    Helpful 1
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    Photo of Tuan N.
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    7 years ago

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    9 years ago

    Helpful 7
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    6 years ago

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    9 years ago

    Helpful 1
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    9 years ago

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    RTMotorworks

    RTMotorworks

    4.9
    (325 reviews)

    I was in need of getting new brake pads and rotors for my 2020 BMW X5. Was getting quotes from a…read morecouple of other places but getting the quote from RTMotorworks was thorough. I was hoping I just needed brake pads for the front and hopefully not all 4 wheels at the time. They were very responsive and the quote was comparable to other places, if not better. Decided to take it in on a Friday in the morning. Checked my wheels and told me I just needed the front brake pads and rotors replaced. The back was still good. Sigh of relief somewhat. They were able to get the pads and rotors replaced for little under 3 hours. Time went by and they were updating me during the whole time. Great service and team here. Will definitely bring my car back in to get other services done. No issues whatsoever with the new pads and rotors.

    PROBLEM: ALIGNMENT ISSUES, CUSTOMER SERVICE, ACCOUNTABILITY…read more When I first tried to leave a review, my account was somehow blocked from posting specifically for RTM, while I could still review other businesses. I contacted Yelp, and by coincidence, the representative I spoke with was also RTM's Yelp rep. He said it was strange that I couldn't post only for RTM. After I explained my situation, he advised me not to leave a review and instead take the matter to small claims court--which I did. During the hearing, the judge seemed to understand my side, but the ruling ultimately favored RTM. Despite being advised not to post this, I'm sharing my experience here because the situation still doesn't sit right with me--especially given Yelp's controversial review practices. On 10/1/25, my rear right adjustable control arm snapped. My car has aftermarket wheels, tires, and suspension components, so a precise alignment is critical to ensure proper fitment without rubbing the fender. I initially went to TM Auto (located across from RTM) for the control arm replacement. After installation, TM took my car to RTM for alignment. I specifically asked them to match the rear right alignment to the rear left, which was set at -2.8 degrees. When I went to pick up my car, I immediately noticed the rear right wheel did not match the rear left. The camber was visibly off. I pointed this out to the technician, but he insisted the alignment was correct and that there were no machine or human errors. After repeated requests, they put the car back on the rack, but instead of rechecking, two additional technicians came out and dismissed my concerns with questionable explanations: "Toyota made the fenders uneven." "Your control arm is made in Taiwan/China--what do you expect?" Despite putting the car back on the rack, they never rechecked the alignment. They simply removed the car and stood by their original claim. With no resolution, I had no choice but to drive the car home. Because the alignment was incorrect, my tires rubbed against the fender the entire way. The next day, I found heat damage, paint cracking, and visible wear on the fender. I came back the next day to talk to Richard (the owner) hoping he would recheck everything, but it was apparent he was "too busy"--despite clearly having time to talk with other customers and then continue working on another car, while ignoring me. I waited outside RTM for over an hour trying to speak with him. When the TM Auto manager asked if he had seen the damage, his response was, "Yeah, so what?"--with no concern at all. After is when I left, and was forced to go to another shop to realign--more driving, more damage done. I used a camber gauge and measured -2.8 degrees on the rear left and -2.0 degrees on the rear right. To confirm, I took the car to my trusted shop, Chewerks in La Habra, where they verified the rear right camber was indeed -2.0 degrees and did not match the left side. Their measurements matched mine exactly. Because RTM refused to recheck or correct their work, this improper alignment caused damage to my car. The rear left side tucks properly, while the rear right sticks out about half an inch, which led directly to the rubbing and damage. I had clear documentation and evidence, but the court still ruled in RTM's favor. I chose not to appeal to avoid spending more time on the matter. A nearby body shop, Cenco Auto Body, quoted over $1,800 to repair the fender (with another shop giving a similar estimate), confirming the extent of the damage. What could have been a simple recheck turned into a costly mistake. Despite everything, RTM did not offer any compensation or attempt to make things right. Seeing RTM's highly rated Yelp profile made their response even more surprising. They're quick to take your money with a smile when things go well, but when issues arise--as in my case--they deny responsibility and make no effort to make things right (In my case, they didn't take money directly, but a receipt was given to TM Auto, and I had to pay TM Auto--which is the same as paying RTM directly). TM Auto went as far as offering RTM to help cover the repair costs, but RTM still refused. TM Auto didn't have to step in for someone else's mistake, yet they still tried--that says everything. Richard (the owner) had my contact information through the small claims process, yet he never made any effort to contact me--even before we went to assigned court date. After what happened, I'm relieved I didn't bring my other cars first--especially since those cars are of higher value. It seems RTM has many satisfied customers, along with a smaller number of unhappy ones. Hopefully, you don't end up in the latter group like me. FWIW: Following the incident, I contacted Hunter to verify when RTM's rack was last calibrated. Abel (rep) advised that its calibration was set to expire later that month. This raises the possibility that their rack may have been out of calibration.

    RPM Garage

    RPM Garage

    4.8
    (165 reviews)

    I had an excellent experience at RPM Garage. I brought my 2022 Lexus GX460 in after noticing rear…read moresway and clunking following a recent suspension lift. Daniel took the time to thoroughly inspect the vehicle and clearly explained what they found -- loose rear suspension hardware and a missing trailing arm nut that could have turned into a serious safety issue. What I appreciated most was Daniel's professionalism. He walked me through everything step by step, showed me exactly what was going on, and answered all my questions in detail. He was calm, knowledgeable, and transparent. He also stayed completely professional and never made negative comments about the original installer -- he simply focused on fixing the issue and making sure my vehicle was safe. They properly re-torqued and secured all the suspension components and performed a full alignment to ensure everything was dialed in. The truck now drives perfectly -- stable, smooth, no more clunking or sway. On top of that, their pricing was very fair and reasonable, especially considering the safety issue they corrected. It's hard to find a shop that combines honesty, skill, and fair pricing like this. If you have a lifted Toyota or Lexus and want knowledgeable, unbiased service done right, I highly recommend RPM Garage. Daniel and the team truly care about safety and quality. Thank you again! -- Paul

    I have been coming to RPM since they opened up their first shop in Irwindale, then followed them to…read moretheir other shop in Monrovia, and now they've opened up their newest location in Monrovia. I haven't been back in a while as I moved out of the area, but with my car having continuous issues, and our current local mechanic not being able to fix it, we decided to head back to RPM to see what they could do. RPM was able to diagnose and repair the problem and now my car runs with no funny noises!. Thanks Steven and team!

    Diagnosis and Services - oilchange - Updated July 2026

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