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NHTSA — Engine Problems


hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
68,832 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2009 Acura MDX engine problems

engine problem

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2009 Acura MDX Owner Comments

problem #6

Mar 012012


  • 45,000 miles


Ongoing problem with 2009 Acura MDX- the check engine warning light sporadically illuminates while driving indicating that the vehicle should be brought to an Acura repair facility. The dealership service department stated that it is a faulty sensor and it is a common problem with the 2009 Acura MDX. The dealership further stated that it would be approximately $700 for them to make the repair as Acura has not yet issued a recall notice for the sensor.

- Temecula, CA, USA

problem #5

Apr 012015

MDX 4WD 6-cyl

  • 90,000 miles
The message center came on telling me to check the oil level and pressure. Pull over asap and have it towed to nearest dealer. This has happened several times now and each time they say its a sensor but how many can there be and how can they keep going out. When this is happening the wipers will short out as well and radio will fade in and out. This has to be a defect within the electrical.

- Omaha, NE, USA

problem #4

Apr 212015


  • 74,000 miles
The contact owns a 2009 Acura MDX. While starting the vehicle, the engine warning light illuminated. The vehicle was taken to a dealer who diagnosed that the nox sensor harness had been chewed on by rodents and would need to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was 74,000.

- Austin, TX, USA

problem #3

Jan 072015

MDX 6-cyl

  • 124,900 miles


Vehicle was running normal. After sitting outside on a very cold day in Wisconsin, the car would not start. It was towed to bergstrom Acura in appleton, wi where a new starter was installed and it started. There was an immediate loud knocking noise. Inspection indicated a large piece of the #5 piston broke off due to a latent manufacturing defect and destroyed the engine. Although this failure occurred in the shop, the piston could have failed on the road which could have seized the engine and caused an accident. An identical failure was also found in Canada on VIN [xxx] that occurred Jan 12, 2015. Acura has been contacted and refused to consider them related and has not logged them as potential safety defects. Photos of the failed parts are available upon request. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Manitowoc, WI, USA

problem #2

Nov 262013

MDX 6-cyl

  • 45,000 miles
Approximately 3 months ago I went to start the medic and it would not start. No lights or any other accessories were left on. The car was jumped and started. Being the car was 4 years old and I had reviews of battery problems in the medic, I had the battery replaced. About two weeks later it would not start again. It was jumped again and taken to an auto repair shop to be tested. The repair shop said the battery was weak, so it was replaced again. It's been about 2 months now and today when I went to start it, the battery was dead again. Three batteries do not go bad that quickly, there is a problem with the electrical system in this vehicle. I have noticed other complaints with this same issue on this web site.

- Cranberry Twp, PA, USA

problem #1

Nov 152011

MDX 6-cyl

  • 34,095 miles
I brought the car into the dealer because I was having transmission problems or power steering problems. I indicated that the car makes a whine at about 1500 RPM. The dealer chose to treat it as a power steering problem. The power steering pump was replaced. There was still a whine although less. The car RPM hangs up on deceleration to a stop. Some times when going down hill the car does not upshift until the car is accelerated even though the road slope is zero. The dealer never informed me when I brought the vehicle in for the original concern that there were some problems with the transmission or torque converter hanging up.

- Cortlandt Manor, NY, USA

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