Q: Muffler delete, check engine light

asked by on

I preformed a muffler delete at home, just unbolted the 2 nuts and slipped it out of the hanger. All was well for a couple days but now the check engine light came on this morning and I'm just wondering if that's the o2 sensors or if there is something else causing this issue?

My car has 56000 miles.
My car has an automatic transmission.

It is illegal in almost all jurisdictions to delete the muffler from your vehicle. Of most concern, the deletion will negatively impact your health, and that of your passengers, as excessive noise is guaranteed to damage or degrade your hearing. The wisest course is to re-install the muffler. With regard to the check engine light, there might be a cause and effect relationship between the removal and the illumination of the check engine light but that will depend on exactly which OBD-II diagnostic codes have been set. A muffler creates a small amount of back pressure and it is conceivable that the normal range of operation of an upstream sensor has been affected by the reduction in back pressure. Still, that possibility is speculative and the actual circumstances can only be determined once the code(s) are read and whether those codes even implicate a potentially relevant component. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you. And, please keep YourMechanic in mind for your maintenance and repairs.

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
  1. Home
  2. Questions
  3. Muffler delete, check engine light

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: After parked overnight, car loses all electrical power

Hello. This may sound strange, but were you parked under a street light when the battery died? I have experienced faulty florescent lights putting out RF signals (the signals that your remote fob use) that do not let the car...

Q: Its locked in neutral

Hi there: If your Civic is an automatic, and the shifter is stuck in neutral, it's most likely a linkage issue that is causing your problems. It might be a damaged shift gate under the shifter that is causing it...

Q: Clicking when A/C is on

The temperature or mode a/c doors in the dash heater air conditioner doors have electronic actuators that when they go bad may start to click when the a/c is turned on or when trying to change door position that has...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...
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.