CHO1234

Just failed DEQ with these codes P2BAD P205C P20BE ??? Please help

Maj. Dundee

Mercedes does not assign "P" codes for eng. problems. Your code reader is assigning its own code number instead of M/B six digit code.

flybd5

Those are standard ODBII codes, Maj. Google search can give the explanations. http://www.diagnostictrouble.com/p-obdii-codes/1

All of these codes have one thing in common, a faulty O2 sensor.

Maj. Dundee

But they are all generic codes relating to every auto maker, but not M/B specific. There's a big difference.

flybd5

That is why ODBII is a standard, so all automakers can use them. The standard offers hundreds and hundreds of codes.

CHO1234

I have tried the website you recommended that has pretty generic codes which does not help me much. Should I buy any specific type of ODB reader that can help me to read codes little more clearly?

flybd5

Dundee has the skinny on that. Give him a few, he'll be by soon to let you know his recommendation.

Maj. Dundee

There is only one code that states that it could be a NOX sensor. These generic codes should only be used as a guide and never as Gospel. This is the reason why every automaker has there own set of codes so the problem can be pinpointed. M/B has 32 pages of listed codes for diesel engines.

https://www.autocodes.com/p20be_mercedes-benz.html -----MAF or leak

http://www.diagnostictrouble.com/obd.../p205c------O2 sensor or DPF

https://www.autocodes.com/p205c.html------O2 sensor or DPF

https://www.autocodes.com/p2bad.html Nox or filter