Skip the auto shop - Our mechanics make house calls

Symptoms of a Bad or Failing Exhaust Air Supply Tube

Symptoms of a Bad or Failing Exhaust Air Supply Tube

Bad or Failing Exhaust Air Supply Tube Inspection

by a top-rated mechanic at your home or office

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.

HAVE SYMPTOMS OF CAR TROUBLE?
Get an $80 diagnostic
by a top-rated mechanic at your home or office.

Get a quote · Book an Appointment · Our expert mechanics come to you.

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.

HAVE SYMPTOMS OF CAR TROUBLE?
Get your car fixed at your home or office.

Get a quote · Book an Appointment · Our expert mechanics come to you.

3. 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Still not sure about your car's issue?
Diagnose your car
What kind of issue are you experiencing?
Brakes are squeaking
Car is not starting
Car is overheating
Car is shaking (vibrating)
Fluids are leaking
Heating and A/C
Smoke or steam is coming out of the car
Warning light is on
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...


Related questions

Q: What is the crankcase emissions control system?

In order to comply with the Clean Air Act and reduce pollution that contributes to environmental damage and the creation of smog, your Accord uses several different emissions controls systems. Your crankcase emissions control system is responsible for maintaining positive...

Q: Smog fail - 1998 Chrysler Sebring

Hi there. I have extensive experience with emissions. The data you have given is very difficult to discern. Being a 1998, I am surprised it is being load mode tested. Typically it's a OBD check. Assuming the Check Engine Light...

Q: Smoke blows from tail pipe

If you are getting excessive pressure build up in the crankcase, then you may have a clogged crankcase breather system. If the breather system is clean, then you may have a broken piston ring causing the buildup. Have the breather...