Fault code 1-2-1 on B200F

chris m · Jan 18th, 2005, 10:28

As far as I know this should be the air mass meter, strangely enough the engine starts first time cold and runs fine, well as fine a sluggish B200 can be in a 240 estate. Any suggestions?

Cheers, Chris

Erling · Jan 18th, 2005, 12:52

This is what I got on the subject:
1-2-1*
Causes of Fault: Faulty signal to/from Air Mass Meter Wiring fault to or in AMM
Symptoms: Various driving problems; fuel consumption

Clifford Pope · Jan 18th, 2005, 13:09

I had that fault code in a B200 some years ago, diagnosed as the AMM. The car misfired and behaved erratically for a few miles after the light suddenly came on, but on restarting it ran apparently perfectly.
I believe that the computer reverts to a default "limp home" mode. Just because the car is running all right doesn't mean though that it is running at optimum efficiency. It would be worth checking the connector and all other wiring and then resetting the code, but if it persists you have little option but to get a new (or secondhand?) one.
I have read of people "repairing" AMMs by resoldering the hot wire inside, but I don't know if that is a feasible option.

chris m · Jan 19th, 2005, 15:13

Swaped the battery yesterday and checked the fault code afterwards. Guess what? 1-1-1! If life could always be that easy (and cheap)! Looks I`m just to stupid to reset the system without disconnecting the battery.

Cheers, Chris

Jan 18th, 2005, 10:28	#1
chris m Member Last Online: Mar 22nd, 2024 16:39 Join Date: Nov 2003 Location: York	Fault code 1-2-1 on B200F As far as I know this should be the air mass meter, strangely enough the engine starts first time cold and runs fine, well as fine a sluggish B200 can be in a 240 estate. Any suggestions? Cheers, Chris

Jan 18th, 2005, 12:52	#2
Erling VOC member Last Online: May 8th, 2007 20:15 Join Date: Dec 2001 Location: Stavanger	RE: Fault code 1-2-1 on B200F This is what I got on the subject: 1-2-1* Causes of Fault: Faulty signal to/from Air Mass Meter Wiring fault to or in AMM Symptoms: Various driving problems; fuel consumption __________________ The older I get, the better I used to be.

Jan 18th, 2005, 13:09	#3
Clifford Pope Not an expert but ... Last Online: Today 17:57 Join Date: Dec 2001 Location: Boncath	RE: Fault code 1-2-1 on B200F I had that fault code in a B200 some years ago, diagnosed as the AMM. The car misfired and behaved erratically for a few miles after the light suddenly came on, but on restarting it ran apparently perfectly. I believe that the computer reverts to a default "limp home" mode. Just because the car is running all right doesn't mean though that it is running at optimum efficiency. It would be worth checking the connector and all other wiring and then resetting the code, but if it persists you have little option but to get a new (or secondhand?) one. I have read of people "repairing" AMMs by resoldering the hot wire inside, but I don't know if that is a feasible option.

Jan 19th, 2005, 15:13	#4
chris m Member Last Online: Mar 22nd, 2024 16:39 Join Date: Nov 2003 Location: York	RE: Fault code 1-2-1 on B200F Swaped the battery yesterday and checked the fault code afterwards. Guess what? 1-1-1! If life could always be that easy (and cheap)! Looks I`m just to stupid to reset the system without disconnecting the battery. Cheers, Chris

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