Symptoms of a Bad or Failing Exhaust Air Supply Tube

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The exhaust air supply tube is an exhaust and emissions component that is commonly found on many road going vehicles. Its primary purpose is to allow air into the exhaust stream so that the exhaust gas temperature may rise to the correct level for the catalytic converter to operate. Catalytic converters and oxygen sensors require a specific temperature in order to operate, and are mostly inoperable for the first few minutes after the engine has been started.

The exhaust air supply tube injects air into the exhaust stream right as it exits the engine in order to increase the temperature so that the catalytic converters and oxygen sensors can reach operating temperature as soon as possible. As the exhaust air supply tube is a component of the exhaust system, is it subject to high heat and stress and is therefore susceptible to rust or corrosion due to extreme conditions. When it fails or has any issues, it can cause problems with the drivability and emissions levels of a vehicle. Usually a bad or failing exhaust air supply tube will produce a few symptoms that can alert the driver of a potential issue.

1. Exhaust leaks

One of the first symptoms of a problem with the exhaust air supply tube is an exhaust leak. If the exhaust air supply tube breaks, cracks, an exhaust leak could develop. Exhaust leaks often produce a hissing or tapping sound coming from the engine bay, and if left unchecked can develop into problems with the engine.

2. Engine performance issues

Another symptom of a possible problem with the exhaust air supply tube is engine performance issues. If the tube does indeed develop an exhaust leak, and the leak is large enough, it may cause the vehicle to experience a reduction in power, acceleration, and even fuel efficiency.

2. Increased emissions

Another symptom of a bad or failing exhaust air supply tube is increased emissions. A blocked, clogged, damaged, or broken tube can also cause the vehicle to produce increased emissions. An exhaust leak due to a broken tube can cause the oxygen sensors to give an incorrect reading and decrease the efficiency of the catalytic converter. A clogged tube will restrict the flow of air into the exhaust stream, which will also affect the operation of the oxygen sensors and catalytic converter. Both of these issues can lead to increased emissions output from the engine, which will be an issue for states where emissions are strictly regulated.

While many newer vehicles are now adopting different emissions technologies, and therefore components, exhaust air supply tubes are still commonly found on many road going cars and trucks. If you suspect that your exhaust air supply tube may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if your vehicle is in need of a replacement exhaust air supply tube.


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Rigoberto

9 years of experience
706 reviews
Rigoberto
9 years of experience
Chevrolet Equinox - Brake Pads Replacement (Rear) - Niles, Illinois
Rigo was great! He got there early, finished the job early, left everything clean. He changed my rear pads and rotors. The original quoted time was 90 minutes, he was done in about 60. He knows what he is doing and I am recommending him to all my friends and coworkers.
Mercedes-Benz C250 - Brake Pads Replacement (Front, Rear) - Chicago, Illinois
Rigo is a maverick hands down. Don’t take your car for work elsewhere. Especially great at Mercedes—this guy knows his profession! I will be using him for everything related to my car going forward.

Arturo

25 years of experience
35 reviews
Arturo
25 years of experience
Kia Forte - Brake Pads Replacement (Front) - San Diego, California
ARTURO is great! very professional , fast, replaced my front brake pads and oil an filter change. everything now works and works well. Brakes have much improved stopping power and engine is smooth and quiet.Arturo is also kind and thoughtful. "Your mechanic" is very fortunate to have Arturo Lopez represent your company. I enthusiastically recommend him and "Your mechanic> as a fine operation Best regards to the Team Peter Marto
Nissan Maxima - Brake Pads Replacement (Front, Rear) - San Diego, California
Arturo was prompt and completed my brake repair, including new rotors in a very efficient manner. I am very pleased with the quality of the work and the parts and will definitely look to have him service our other car in the near future.

Scott

32 years of experience
345 reviews
Scott
32 years of experience
Lexus IS250 - Brake Pads Replacement (Rear) - Denver, Colorado
Always on time, speedy, professional, and pleasant to interact with. The work is always consistent and we'll done. I can't reccomend Scott highly enough!

Michael

10 years of experience
15 reviews
Michael
10 years of experience
Nissan Sentra - Brake Pads Replacement (Front) - Conyers, Georgia
He was promptly on time and got the job done efficiently in a timely manner. I really appreciate the rapid respone on getting the job done! I would most definitely use this service again.

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