Q: Getting code P0131 rough idle, loud, and smell exhaust fumes

asked by on

Similiar issue. While coming out of the store my ML500 started up like a loud truck with rough idle. Plugged it up and got CEL codes P0131 and P0456. I can also smell exhaust fumes, gets louder during exceleration. We changed the O2 sensor to a bosch on "passenger side" code P0456 code went away but still getting P0131, loud/rough idle and exhaust fumes?? Can this be a leak in the exhaust? Cat converter need to be changed? Vacuum Leak? Or fuel filter? This is a major headache! HELP!

My car has 160 miles.
My car has an automatic transmission.

Hello. Codes P0456 and P0131 can come up from a serious exhaust leak. From what you are explaining, it sounds like this is the issue. The exhaust leak will need to be located and repaired before further testing. If there is no exhaust leak, then there may be a leak in the EVAP system from one of the hoses or in the top seal of the fuel tank. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the fumes and rough idle.

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. Getting code P0131 rough idle, loud, and smell exhaust fumes

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: Q: Hesitation when accelerating

Hi There, The radiator fan may have stopped working for a couple of reasons such as a faulty fan motor or faulty fan relay. As you know, this can be dangerous to the motor as it may cause it to...

Q: Electrical problems with keyless entry, headlights and radio

Hello. We will be happy to assist. The problem you are experiencing is common. The symptoms you have are identical to many other SL500 owner complaints. The component which causes all the misbehavior is the EIS (Electronic Ignition Switch). Symptoms...

Q: Q: Transmission stuck in park

In order to shift out of park, the transmission module needs to see the engine idling and the brake pedal depressed. If one of these criteria is not met, then it will not let you shift out of park. There...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.