2006 C230 Sport sedan.Showing codes: (From generic code reader)
P2180 System Too Lean Off Idle (Bank 2)
P2188 System Too Lean at Idle (Bank 1)
P2190 System Too Rich at Idle (Bank 2)
All useful information but what do I check for as the cause?

TIA Dave.forumlinks {text-align: left;}

How many miles on the car? What precipitated the errors? Was something replaced recently?

O2 sensors failing can trip lean/rich errors like this...but so can fuel pressure regulators.

Need more info...

80,000 MILES
Nothing replace recently.
About four months age the intake maniflod was replaced. Apparently they are noted for this.
Car has no symptoms.

The intake manifold would have been my guess, but recently replaced
I would still look for intake leaks, like one of the gaskets didn't seal properly.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Now that you have copied the codes.

Clear all codes, and drive it to see if they all come back (this may take seconds - two days depending on cause) .
If the battery voltage dropped off during service or for any other reason, it sets random phantom codes.
There are few things more frustrating than chasing phantom codes.

If this has been done, we can continue diagnosis now.

.

__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

W:
I did reset or clear the codes. Upon starting the Check Engine light still came on. But, the next day it was off. Comes and goes. Came and went even before resetting the codes. No outward signs of anything wrong. Starts fine, idles smooth, no hesitation.
By the by dubya, I've been a gear head all my life and never heard of an intake manifold "failing" whats the deal? Do they crack, warp, what?

Thanks, Dave

There is nothing normal about the C230 intake manifold.

C230 Intake Manifold Hole Zoom Out | TermiteWerks.info

W203

C230 Intake Manifold Front | TermiteWerks.info


.

Attached Thumbnails

 

__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

Thanks dubya. Very informative. Me thinks I'm going to dump this POS. Sad too, because my wife really likes this little roller skate. But, really, one part goes south and $2400.00 for a new intake, parts and labor? Plus the balance shaft gear issue.
Not something I want to own. What happened to Benz?
Thanks again. You're always a great help.
Dave.

Always happy to help.

.

__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/