P2031 Mercedes-Benz -

Question

Took my 2010 ML350BTC (27k miles) to Car Spa because the Check Engine light is on - MB Houston cannot get me in for two weeks. The technician at Car Spa shows a code of

DTC Reported:
"P20313 = Unknown Trouble Code" *Note: Emissions related FAILURE Trouble Codes will appear in Bold and Italics

MIL Status: The Malfunction Indicator Lamp is Commanded ON

The tech told me he looked the code up and wrote down that it could be one of possibly three things:
-Fuel trim limit
-Mass flow sensor faulty Bank 2
-Fuel injectors faulty

I cannot find this code and the Mercedes Benz Houston service department told me on the phone that they do not recognize that as a Mercedes Benz trouble code.

Do you have any knowledge of what this code means?

Answer 1

Hi there,

This code indicates an issue with the exhaust gas temp sensor. Here is a list of possible causes.

P2031 MERCEDES-BENZ - Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2

Read more: https://www.autocodes.com/p2031_mercedes-benz.html