Skip the auto shop - Our mechanics make house calls

Q: Carbon canister making a loud hissing noise.

asked by on

check engine light was on ( bank 1 system too lean p0171 )and someone suggest to change the carbon canister and now it's making a loud hissing noise. The old one made a low level hissing noise. How can I fix this? The canister is OEM purchased new.

Thx Shawn

My car has an automatic transmission.

Hi there. The loud hissing noise could be caused by a split vacuum hose or a loose hose. Follow the hiss to make sure it is the canister and not a separate hose. The code stored for the Check Engine Light would not be affected by a leak at the canister because it would have leaked to bank 1 and bank 2 setting a code for each. I strongly suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. YourMechanic has several available technicians that can assist you with a Check Engine Light inspection and can conduct a diagnostic on the hissing noise so that this can be addressed appropriately.

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!
  1. Home
  2. Questions
  3. Carbon canister making a loud hissing noise.

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: Lexus96 es 300 idles high but drops okay going into drive it idles back up then drops then go into drive while holdn brake pedal

This may be a sign of a faulty MAP sensor as the vehicle responds adversely to a load put on the motor (i.e. putting it in gear). The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal...

Q: Distributor

The distributor on the 1996 Accord has an integrated Cylinder Position (CYP) Sensor, Crankshaft Position Sensor (CKP) and Top Dead Center (TDC) Sensor. If you have replaced the distributor due to diagnostic trouble code P1382 setting, which involves faults with...

Q: I replaced my thermostat and the housing and its still registering hot why

Overheating can be caused by a number of things such as low coolant levels, a faulty thermostat, a clogged radiator or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.