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Please explain fault code 1-2-1? 850

posted by  pgao on  Sun Mar 10 14:52 CST 2002
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last visit: Fri Dec 27 08:18 CST 2013
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Hi, all,

I pulled the codes from A2 socket for "check engine light" and got codes 4-3-5 and 1-2-1. I understand the code 4-3-5, but need more detailed explanation for code 1-2-1. what does that stand for? Is it a serious problem? Thanks.

1995 Volvo 850








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Please explain fault code 1-2-1? 850

posted by  someone claiming to be Steve on  Sun Mar 10 18:24 CST 2002 [RELATED]

Depending on which system you have it is the mass air flow sensor (which bolts to the aircleaner housing) or manifold pressure sensor bad or giving a faulty signal







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