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

asked by on November 14, 2016

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.

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?
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

How much do mechanics charge to fix a blown head gasket on a 1996 BMW

Hey there. You are looking at a minimal charge just to remove the head and install the head with a new gasket to be 9.0 hours. There is always additional charges like disassembly of cylinder head to prepare to go...

Coolant finishes 3-4days

Hello. This can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. The fact that you are losing water every 3-4 days without leaks, this would suggest the...

Transmission pops out of gear

Your car has an electronically controlled transmission. The strange behavior may be due to a bad switch on the column, or there may be some reason why the program doesn't want it to shift into Drive or Reverse. Maybe it's...

Related articles

How Long Do Exhaust Supports Last?
You You are likely aware of the fact that the exhaust system of your car is located under it. It needs to stay perfectly in place in order to work as it’s meant to. The exhaust supports are what make...
Symptoms of Bad or Failing Exhaust Supports
Common signs include the exhaust pipe seeming loose or swaying, the muffler hanging to the ground, and the exhaust sounding louder than usual.
How Long Does an Exhaust Manifold Last?
You've You've probably heard of the exhaust manifold before, but that doesn't necessarily mean you're clear on what it does. In fact this system is very important in the operation of your vehicle. It connects the cylinder head to your...