Skip the auto shop - Our mechanics make house calls

Q: Would a major leak from my exhaust back box cause it to fail the emmisions test and LAMDA reading

asked by on

Would major leak to exhaust back box be a cause of emmisions test failure or lamda test failure

My car has 107000 miles.
My car has a manual transmission.

A: Hello - while an exhaust leak can have a mi...

Hello - while an exhaust leak can have a minor effect on emissions, I would not expect that to cause a "Fail" - UNLESS your state or metro area does tolerate an exhaust leak for safety reasons (carbon monoxide poisoning for example). The inspection rejection notice should indicate whether unacceptable levels of hydrocarbons or oxides of nitrogen were the cause (or some other issue) were the cause of the failure. This information will instruct what problem area to pursue to correct the failure. Check for any problem codes, whether the Check Engine light is on or not. These will guide diagnosis and repair. If you need help detecting and repairing a leak, a qualified technician from YourMechanic can assist you with this.

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

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: Own a 1989 F150, unusual rattling sounds in R and D, not in P or N, sound is back when giving it gas but goes away when cruising

Hello, thank you for writing in. The first thing to do is check around the vehicle, specially under the body where heat and other protective shielding may be used, the exhaust hangers holding the exhaust pipe, and under the hood....

Q: What causes play in the steering?

There are mechanical components inside the steering system that do tend to wear over time and you may notice a little extra play over a period of time. Usually this feeling comes from worn inner or outer tie rods. The...

Q: Emissions test

According to the Arizona DMV website, the emissions test will perform the following during an inspection: On-Board Diagnostic (OBD) Test: OBD tests monitor vehicle components and evaluate any system problems. Gas cap test: Makes sure the gas cap can...

Related articles

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...
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...
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.