I was driving the car, when I saw a sign pop up on the dash saying " Emission Systems problem" and the car completely stopped within a 100 feet. The car passed the Emissions and Inspection the previous day and I have a registration till June 30, 2026 now. There was a clicking noise that I heard when driving during the morning. I had never heard it previously. There was an oil change sign for about 3-4 days buy there were no other warning lamps. Here is the video of the problem from the dealer - [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Herndon, VA, USA

After traveling about on a 4 hour drive, my daughter who was driving the vehicle slowed down to make a turn. That's when she heard a loud clanking noise coming from the engine. She immediately pulled over and turned off the engine/vehicle. I went to meet her, and replicated the same problem when I turned the ignition switch to to on. It sounded as if there was some large piece of metal loose inside the engine -- it did not have consistency and was highly variable with regards to the sound it was making. The "Check Engine" light was on. Fortunately this did not occurr going at high/freeway speeds, yet the safety was compromised when my daughter was fortunate enough to leverage the momentum to get to the side of the road. Additionally, she was not in a spot where there was a shoulder/it was under an overpass, so she had to be careful and turned on her emergency lights. We had the vehicle towed to the nearby Honda Dealer. I am attaching their report and findings. They recommended engine be replaced; which we agreed to have done. Additionally, we continue to have problems due to the mounting and shacking which we believe comes from the installment of the new engine. We are submitting that report as well. At present, my daughter is not driving the vehicle and is relying on rides or borrowing other people's vehicles.

- San Antonio, TX, USA

While driving our well-maintained 2016 Acura MDX on a 30-minute drive on [XXX], I heard a pop, and then the engine lost power. I couldn't get the RPMs over 2500. A fluttering noise evolved into knocking and the vehicle became increasingly sluggish and heavy. The check engine light started blinking, but the vehicle's temperature gauge showed no changes. There wasn't any smoke or unusual smells. I felt terrified trying to get safely onto the side of the road with cars driving at full speed. I had the car dropped off at our local service station and the owner determined that the engine cylinder was loose and lost compression with a knock. He says that the engine light did not give a code. The owner determined that we need to replace the engine. A rebuilt engine will cost us $8,000. When I called Acura, the service person I spoke with seemed surprised that our 8-year-old car with only 77,000 miles needed a new engine. Since Acura has so many cars to deal with on the latest recall, he said it would be weeks before anyone can look at it. I researched and found that our VPN was NOT included in the recent recall of 2016-2020 model year MDX vehicles all with the same problems. How can that be"??" INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Bethesda, MD, USA

I am writing to bring to your immediate attention a critical safety issue with my 2016 Acura MDX, and the subsequent exclusion of my vehicle from a known recall that directly addresses the problems we are experiencing. Without any prior warning, we began hearing a fluttering sound coming from the engine whenever we accelerated. This noise progressively worsened and evolved into a pronounced knocking noise.Concurrently, the vehicle became increasingly sluggish and heavy, resulting in significant difficulty when accelerating. Despite these alarming symptoms, the vehicle's temperature gauge showed no changes, there was no smoke or unusual smells, and the check engine light did not activate. Gravely concerned for our safety, we promptly took the vehicle to our local mechanic for a thorough inspection.The diagnosis revealed significant engine damage, specifically to the connecting rod bearings and the crankshaft. Given the severity of the issue, we then brought the vehicle to the closest Acura dealership, Pohanka Acura. The service advisor informed us of a recall affecting the engine and rod bearings in the 2016 Acura MDX model. They also confirmed that our vehicle's engine was indeed damaged due to the same rod bearings and crankshaft issue described in the recall. However, despite this clear evidence, we were informed that our vehicle's VIN was excluded from the recall repair. The technician who performed the diagnostic on our vehicle recommended a new short engine block, which is was concerning especially since it mirrors the known recall issue. I am requesting that the NHTSA urgently investigate this matter. I hope the NHTSA treats this issue with the utmost urgency and seriousness it warrants. The safety of Acura MDX owners is at stake, and immediate action is essential to prevent further incidents and ensure our safety. Thank you for your prompt attention to this critical matter. I await your swift response and resolution. Sincerely, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA),

- Brambleton, VA, USA

See attachment for detailed explanation

- Vancouover, WA, USA

Acura MDX 2016 SH-AWD with 113366 miles diagnosis according to warning lights. DTC test certification codes: P0301 Misfire No. 1 cylinder P0306 Misfire No. 6 cylinder P0300 Random Misfire P0420 Catalyst System efficiency below threshold B1 Recommendation was that the Catalytic converter be replaced. All these codes were identified under Honda's TSB 20-100 dated 2/2021 on Odyssey, Pilot and Ridgeline models where AH extended warranty to 10 years from date of purchase or 150K. These V6 engines are pretty close to that of the 2016 MDX. Is there a remote possibility that these DTC codes could exist in MDX V6 engines when an issue arises similar to those in the Honda vehicles? These DTC codes appeared 24 hours/37 miles after a routine oil service on 3/26/2024 at Advantage Acura of Naperville with a perfect inspection report. The malfunction occurred in the vicinity of McGrath Acura of Westmont on the following day of 3/27/2024. The concern is if any of the emission system components were damaged during the routine oil service. Advantage Acura have in the past installed brake pads backwards on my Acura TL 2010 for which I do have proof.

- Naperville, IL, USA

Engine rod bearing knocking. Will eventually fail and engine stop running at anytime. My independent service center did confirm the problem. The car has not been to the Dealer as they refuse to include my VIN # in the current recall for this very problem. No warning lights appeared, but slight ticking sound shortly turned into a loud knocking.

- Sierra Vista, AZ, USA

There is a current recall on Acura/Hondas with the issue that we are having with our car. Knocking engine, car diagnosed with connecting rod bearing issue. Apparently not included in recall. This makes no sense. Car has been undriveable since 11/9/23 with no help from Acura/Honda Corporate. We have been trying to come to a resolution with no help. This should fall under the recall and where our car was manufactured should be looked into because on car forums there are many cars with our VINS having the same issue. This issue has affected more cars than Acura is saying and needs to be looked into before someone gets seriously injured. Acura/Honda are NOT taking this seriously at ALL.

- Marlborough, CT, USA

My 2016 Acura MDX, which was well maintained, locked up while driving at around 45 mph this past September. Upon a certified mechanics evaluation, it was reported that the vehicle would require a new engine as it was "locked up". Shortly afterward, I read that certain model/makes of Acura vehicles were being recalled for this very reason/problem. I called Acura recall client support who informed me that the final list of recalled vehicles would not be available until January 2024 and that I would receive a letter in the mail. When I did not receive a letter, I called again and was informed that my VIN was not included in the recall. This is despite that thousands of other 2016 Acura MDXs were recalled. I find it difficult to accept that a known issue that necessitated a substantial recall of vehicles did not apply to my Acura since it was the exact issue being addressed. Especially since the vehicle was maintained very well from the time of purchase. My teenage son was driving the vehicle and was stranded along a dark highway until I could pick him up about 45 minutes later. There were not warning lights or notices of this pending failure. The vehicle could only partially be removed from the traffic lane at the time it locked up which resulted in a hazard, not only for my son, but for other travelers as well.

- Ligonier, PA, USA

The connecting rod bearing has failed in my vehicle. It is causing damage to the engine, there are metal shavings found in the oil, and the engine is producing a strange and unusual sound. It's causing the engine damage and wear and causing it to seize. The incident has been reported to the dealer and has been confirmed in an inspection report. There is a CURRENT recall from NHTSA and Honda/Acura for this exact issue that includes the same make, year and model of my vehicle, however when VIN numbers were split, my vehicle was not included in the recall. The recall should be expanded to not only include more vehicles but those that are actually being impacted.

- Plymouth, MN, USA

While driving on the highway the engine lost power. There was no warning.the car became inoperable. The safety of passengers and others traveling the highway were at risk. The dealer confirmed that the engine failed and advised that the rod bearing spun. The vehicle is available for inspection and it is unknown as to whether the manufacturer inspected the vehicle.

- Scottsdale, AZ, USA

The car suffer complete engine failure while driving on the highway. I had the car towed to an acura dealer. The acura dealer has informed me that the engine rod failed There is a recall by acura for 250,000 vehicles incuding the same year and model for the same problem. The engine is availble for inspection. My vehicle is not under recall. i was informed by Acura customer relatiins that they will not help me. I was informed by a acura dealer that they will can replace the engine with a used engine for 9000$. i said ok but then wondered if the engine they would replace it with was under recall. The looked into it and have informed me that the engine is in fact one of the recalled engines and then asked me if i wanted to proceed with the replacement with an engine that is dangerous... This seems incredible to me and should be illegal and certainly dangerous..

- Venice, CA, USA

while driving on a local road (not highway), engine began to make a very loud sound. sounds like metal on metal inside engine. called local ACURA dealer and they said that the connecting rod recall/problem that was announced in November 2023 "does not apply to my VIN".

- Alpharetta, GA, USA

Ticking Sound in Engine Diagnosed by Dealer as same issue reported in recall for Year Make and Model of Vehicle. Diagnosed with need for engine replacement ($8,700). All service requirements by manufacturer done by dealer. Dealer says it is unsafe to drive. Vin not covered under recall NHTSA # 23V-751

- Little Rock, AR, USA

My engine light enabled & my car slowed < 30 mph while driving on a frwy on 2/4/23. I exited & turned the engine off. It was late at night in a rural area, so I waited a bit & turned the car back on. Engine light was no longer on, so I continued to my destination (GA). On 2/5/23, while driving on the frwy, my engine light enabled & my car quickly slowed to < 20 mph. The light stayed on & my car had little power (limped along). After a few hours, there was no change & my car was not drivable. I got a hotel for the night & took my car to the nearest Honda dealer on 2/6/23. The service dept told me my car needed a new engine because the bearing or rod had gone bad (terminology may be slightly off). My car had UNDER 100K miles & I was told it needed a new engine. The Honda serviceman told me he had 3 other vehicles in house with the same issue & he wouldn-??t be able to get to my car for a while. I called the nearest Acura dealer & spoke with a serviceman there, he told me to ask the Honda serviceman to clear engine code & slowly drive the car to the Acura dealership. The Honda serviceman warned me that my car may not make it to the Acura dealership but might if slowly. He cleared the code & I slowly drove to the Acura dealership. I reached the Acura dealership shortly before closing time on 2/6/23, I dropped my car off with the service dept & got a hotel room. I was contacted the following day, 2/7/23, by the Acura serviceman & he confirmed a new engine was required. There-??s now a recall on the same issue my car experienced for same make, model & year, however Acura states my VIN was not affected. It is highly unlikely that my same make, model & year vehicle that experienced the exact issue for the recall is simply coincidence.

- Liberty Hill, TX, USA

First on off glitching when ever accessory mode is used WHILE IN MOTION, FIRST BRAKELIGHT HAD WARNING THEN WARNING ABOUT TRAILER STABILITY ASSIST. WHEN I WENT IN REVERSE, THE WHOLE DASHBOARD INCLUDING THE NAVIGATION SCREEN WENT BLACK AND THE CAR FELT LIKE THE ENGINE STOPPED. THIS HAPPENED A FEW TIMES. I DON'T THINK THE ENGINE ACTUALLY STOPPED THOUGH BECAUSE I DID NOT HAVE TO RESTART THE CAR. THE BRAKE LIGHT ERROR MESSAGE HAS OCCURRED DRIVING FORWARD AS WELL, BUT NOT ACCOMPANIED BY THE BLACKOUT OF THE DASH AND NAV PANEL. Steering becane stiffer ALL OF THIS HAPPENED WHILE IN MOTION.

- Sierra Vista , AZ, USA

On a multi-day road trip, the car had a temporary complete loss of power on two separate days. Both times this happened after several hours of driving at highway speeds on I-15 in California, outside temperatures were in the 90s. After a slight deceleration and then applying the accelerator again, there was a 'clunk' like sound possibly from the transmission, and then a complete loss of power. The first time I tried to pull over to the breakdown lane, and then regained power after about 2-3 seconds. The second time, we were in the middle of traffic and were not able to pull over, but again after 2-3 seconds, the power came back. The engine did not rev up when applying the accelerator and there were no dashboard lights. This appeared to be either a transmission, fuel delivery, or engine management/drive by wire issue. While we luckily did not get into an accident, we did slow down significantly on the highway, requiring other drivers around us to break, or change lanes. I have made an appointment with my independent mechanic, but the car has not been inspected yet and I am not able to forcibly reproduce the issue.

- Louisville, CO, USA

This 2016 Acura MDX with the 9 speed automatic transmission and the Auto Engine Shut Off function will sometimes fail to restart the engine after cutting off. This presents a safety issue as the car stalls in traffic. This has happened multiple times over the last 4 years (most recently 06/02/2022). This issue was noted to the Acura service department who stated they could not find an issue.

- Richmond, VA, USA

when air conditioner is running in hot summer days, the car hesitates to restart (sometimes) following idle stop engine shutoff after coming to a full stop at a stop sign or red light. I strongly feel this is a safety concern as this impedes traffic and can causes road rage. If needed I can share video of this situation recurring time to time. Car starts just fine every single time outside of idle stop situations and battery health is near perfect. There are hundreds of forums talking about this exact condition across acura models.

- Attleboro, MA, USA

Acura has an open recall that shows the symptoms or malfunctions my vehicle is having for my year, make, and model, but the vehicle I.D number doesn't show this type of recall for it. Now, these things do not add up give the malfunctions I'm experiencing. First and foremost, the car stalls, I could be on the NJ turnpike and as soon as traffic slows down car goes into neutral on its own and engine just shuts off in the middle of traffic, do not know when its going to happen, it just happens. Car then turns on once fully stopped and foot is on break but probably after another hour same thing and it is continuous. I have replaced a number of things and it is still malfunctioning. NHTSA Recall # 19V-060. No check engine light recorded since i bought the car and when running, car runs smoothly. It is preowned vehicle, called Acura and I was told that the fuel pump was replaced, but according to the recall it also needs a software update to fix the malfunction. At this point I just need help on taking the proper steps on getting this safety issue fixed.

- Newark, NJ, USA