Skip the auto shop - Our mechanics make house calls

Q: Have e320 2000 Mercedes Benz getting code p1491 and check engine light on.

asked by on

The check engine light is on and code saying High Refrigr Air Pressure

My car has 117000 miles.
My car has an automatic transmission.

This code is related to the pressure in the AC system and suggests that it is too high. When this happens it is usually a result of some kind of blockage in the system. There is also a pressure sensor located usually on the side of the radiator that when faulty can also cause this code to register. I would suggest having an expert from YourMechanic come to your home to diagnose and repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • Have e320 2000 Mercedes Benz getting code p1491 and check engine light on.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Check engine light on again

Your check engine light may come on for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad catalytic converter, bad spark plugs or wires and many other reasons. Unfortunately due to the...

Q: Alarm went off in Panic mode

This sounds like a good time to check the owner's manual to see if it mentions this at all. If it's an aftermarket alarm system, it may need to be manually reset through a certain procedure that is model specific....

Q: Lights not working

Hi there. If the engine is starting and running then the battery should be fine. Typically if everything else in the vehicle is working then the battery is not the problem. If you have an entire section of lighting that...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...