I own a 2018 newmar king aire motor home. I had a gen 5 diesel exhaust fluid (def) sensor fail at 10,000 miles. I was one of the lucky ones in that when the dash lit up with warnings I was able to drive it home before it went into derate. I was less than 200 miles away at the time. There are many links on www.irv2.com about this issue with many other motor home owners. Some very scary putting lives at risk. The derate limp mode of being able to go 5mph just does not suffice. There is nothing on the warnings that tell you how many miles you can drive before derate. There is no 'reset button' to get you either home or to a service center. (suggestion, since this is an epa mandate, couldn't the epa let the manufacturers have a reset button to get to a service center? It would require a call to the epa, must be manned 24 hrs a day, so that they can keep track so people don't abuse.) I am all for reducing emissions on diesel engines, but I am not for putting my life at risk to achieve this. That is what is happening today. Lives are being put at risk. [xxx] parts of this document have been redacted to protect personally identifiable information pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).
The worst 2018 Newmar King Aire problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Fuel system1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Fuel system1
Recalls 11
Structure: body: door
- What is wrong
- Newmar Corporation (Newmar) is recalling certain 2023-2024 London Aire, Essex, and 2016-2024 King Aire motorhomes. The baggage door skins may come loose and separate from the door frame.
- Risk
- A detached door skin can become a road hazard, increasing the risk of a crash.
- Remedy
- Dealers will inspect and add fasteners and adhesive the door as necessary, free of charge. Owner letters were mailed August 22, 2025. Owners may contact Newmar customer service at 1‑800‑731‑8300. Newmar's number for this recall is 619 RSB.
Recall number 25V431000 · Recall details
Equipment: recreational vehicle/trailer
- What is wrong
- Newmar Corporation (Newmar) is recalling certain 2018-2020 Mountain Aire, Essex, and King Aire motorhomes. The bedroom fascia header may fall unexpectedly onto the bed.
- Risk
- If the fascia header falls while there is an occupant in the bed, it can increase the risk of an injury.
- Remedy
- Newmar will notify owners, and dealers will add screws and brackets to properly secure the fascia header, free of charge. The recall began September 17, 2019. Owners may contact Newmar customer service at 1‑800‑731‑8300.
Recall number 19V610000 · Recall details
Equipment: electrical
- What is wrong
- Newmar Corporation (Newmar) is recalling certain 2018-2019 Bay Star, Essex, New Aire, 2018 Bay Start Sport, Canyon Star, Dutch Star, King Aire, Mountain Aire, Ventana LE, Ventana, and London Aire motorhomes. The power supply for the WiFiRanger may overheat.
- Risk
- An overheated power supply can increase the risk of a fire.
- Remedy
- Newmar has notified owners, and dealers will replace the power supply, free of charge. The recall began April 18, 2019. Owners may contact Newmar customer service at 1‑800‑731‑8300.
Recall number 19V257000 · Recall details
Equipment: recreational vehicle/trailer
- What is wrong
- Newmar Corporation (Newmar) is recalling certain 2018-2019 Newmar Ventana LE, Mountain Aire, Essex, Ventana, Dutch Star, New Aire, London Aire and King Aire motorhomes. The affected vehicles have entry doors that have latch rods that may be improperly adjusted, allowing the door to open during transit.
- Risk
- If the door opens during transit, it can increase the risk of injury or a crash.
- Remedy
- Newmar will notify owners, and dealers will readjust the door latch rod, free of charge. The recall began September 5, 2018. Owners may contact Newmar customer service at 1‑800‑731‑8300.
Recall number 18V518000 · Recall details
Equipment: recreational vehicle/trailer
- What is wrong
- Newmar Corporation (Newmar) is recalling certain 2018 Newmar Bay Star, King Aire, London Aire, Mountain Aire, Bay Star Sport, Canyon Star, Dutch Star, Essex, New Aire, Ventana LE, and Ventana motorhomes. When the ignition key is in the off/accessory position and the battery disconnect is on, the slide-out rooms on these vehicles may move in or out unexpectedly.
- Risk
- If the slide-out room moves unexpectedly, it can increase the risk of injury.
- Remedy
- Newmar will notify owners, and dealers will replace the slide-out room controller, free of charge. The recall began August 24, 2018. Owners may contact Newmar customer service at 1‑800‑731‑8300.
Recall number 18V438000 · Recall details
Visibility: windshield wiper/washer
- What is wrong
- Newmar Corporation (Newmar) is recalling certain 2018-2019 Newmar Mountain Aire, London Aire, Essex, and King Aire motorhomes. These vehicles are equipped with windshield wipers that may have an incorrect bend, possibly preventing the wiper arms from properly contacting the windshield. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 104, "Windshield Wiping and Washing Systems."
- Risk
- If the windshield wipers do not properly contact the windshield, the driver's visibility may be reduced, increasing the risk of a crash.
- Remedy
- Newmar will notify owners, and dealers will replace the wiper arms, free of charge. The recall began on August 3, 2018. Owners may contact Newmar customer service at 1‑800‑731‑8300.
Recall number 18V387000 · Recall details
Electrical system: wiring: fuses and circuit breakers
- What is wrong
- Newmar Corporation (Newmar) is recalling certain 2018 Newmar Bay Star, Bay Star Sport, Canyon Star, Ventana LE, Ventana, Dutch Star, New Aire, Mountain Aire, London Aire, Essex, and King Aire motorhomes. The electrical connections in the breaker box may not be properly tightened, possibly causing the connections to overheat.
- Risk
- Overheating of the electrical connections can increase the risk of a fire.
- Remedy
- Newmar will notify owners, and dealers will tighten the loose electrical connections, as necessary, free of charge. The recall began on May 17, 2018. Owners may contact Newmar customer service at 1‑800‑731‑8300.
Recall number 18V236000 · Recall details
Electrical system: wiring
- What is wrong
- Newmar Corporation (Newmar) is recalling certain model year 2016-2018 Bay Star, Bay Star Sport, Canyon Star, Dutch Star, Essex, King Aire, London Aire, Mountain Aire, New Aire, Ventana and Ventana LE motorhomes. These vehicles may have a loose power connection at the Automatic Transfer Switch (ATS), possibly resulting in a build up of heat.
- Risk
- The build up of heat in the wiring from the loose power connection can increase the risk of a fire.
- Remedy
- Newmar will notify owners, and dealers will inspect the electrical connection at the ATS, tightening it as necessary, free of charge. The recall began on February 5, 2018. Owners may contact Newmar customer service at 1‑800‑731‑8300.
Recall number 17V830000 · Recall details
Equipment
- What is wrong
- Newmar Corporation (Newmar) is recalling various 1995-2018 motorhomes. A list of the affected vehicles available at: These motorhomes are equipped with Kidde Plastic-Handle or Push Button 'Pindicator' Fire Extinguishers that may become clogged, preventing the extinguisher from discharging as expected or excessive force may be needed to activate the extinguisher. Additionally, in certain models, the nozzle may detach from the valve assembly with enough force that it could cause injury and also render the product inoperable. For a full list of the affected fire extinguisher models visit:
- Risk
- In the event of a fire, if the fire extinguisher does not function properly, it can increase the risk of injury.
- Remedy
- Newmar will notify owners, and instruct them to contact Kidde for a replacement fire extinguisher, free of charge. The recall began on February 7, 2018. Owners may contact Kidde customer service toll-free at 1‑855‑262‑3540, or online at www.kidde.com and click on "Product Safety Recall" for more information or owners may contact Newmar customer service at 1‑574‑773‑7791. Newmar's number for this recall is 17E-062.
Recall number 17V809000 · Recall details
Fuel system, diesel
- What is wrong
- Newmar Corporation (Newmar) is recalling certain 2018 London Aire, King Aire, and Essex motorhomes built on Spartan Motors chassis and equipped with Cummins ISX 15L engines. These engines have a fuel pump whose drive gear could possibly slip on its drive shaft, causing a fuel pump function loss, resulting in an engine stall.
- Risk
- Failure of the fuel pump will result in an engine stall, increasing the risk of a crash.
- Remedy
- Spartan will notify the vehicle owners, and Cummins dealers will replace the fuel pumps, free of charge. The recall began on July 28, 2017. Owners may contact Cummins customer service at 1‑800‑286‑6467, Spartan customer service at 1‑800‑543‑5008 or Newmar customer service at 1‑800‑731‑8300. Newmar's number for this recall is 17015.
Recall number 17V413000 · Recall details
Suspension: front: control arm
- What is wrong
- Newmar Corporation (Newmar) is recalling certain 2017-2018 Dutch Star, 2016-2018 Mountain Aire and London Aire, and 2012-2018 Essex and King Aire motorhomes built on a Spartan Motors chassis. The ball joints on the independent front suspension (IFS) modules can loosen and separate, leading to a partial loss of steering.
- Risk
- A separated ball joint can cause a loss of steering control, increasing the risk of a crash.
- Remedy
- Newmar will notify owners, and Spartan service centers will remove, clean, apply thread locker, reinstall and torqued the ball joints, as necessary, free of charge. The recall began on May 3, 2017. Owners may contact Spartan at 1‑800‑543‑4277 to locate a qualified service center or contact Newmar customer service at 1‑574‑773‑7791. Newmar's number for this recall is 17004.
Recall number 17V195000 · Recall details
Technical service bulletins for the 2018 Newmar King Aire 29
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- On certain motorhomes, the baggage door skins may come loose from the door frame perimeter, possibly...
- On certain motorhomes, the bedroom fascia header has the potential to fall unexpectedly on top of the bed...
- Equipment
- Some coaches equipped with both the SilverLeaf system and a TRC transfer switch (model 40350RVC-40350RVC3)...
- The driver console USB port to the Xite G3 system may not function properly when plugged into the USB...
- Newmar has made a change to the water pump circuit fuse on certain coaches to improve customer experience
- If a customer complains about their satellite, this product improvement bulletin may be helpful
- Latches/locks/linkages: doors: latch
- Equipment
- This bulletin was created to inform dealers and techs that an updated linkage is available that provides a...
What 2018 Newmar King Aire owners say
Most recent owner complaints, unedited.
Compare the 2018 Newmar King Aire
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Questions about the 2018 Newmar King Aire
Is the 2018 Newmar King Aire reliable?
Owners have filed 1 complaint about the 2018 Newmar King Aire, close to a typical King Aire model year.
What is the most common problem with the 2018 Newmar King Aire?
Fuel and propulsion system, with 1 complaint.
How many recalls does the 2018 Newmar King Aire have?
11 recalls, covering structure, equipment and visibility.
Was there a recall on the 2018 Newmar King Aire fuel system?
Yes, 1 recall: 17V413000. Check your VIN to see if your car still needs the free repair.
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