1992 Volvo 240 Lean fuel problem

1992 VOLVO 240
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JGS1951
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1992 Volvo 240 4 cyl Two Wheel Drive Automatic
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I have engine codes 231 & 221 which indicate a lean fuel condition. Can you give me any causes of a lean fuel condition? Thank You
May 17, 2008 at 7:56 PM
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BLACKOP555
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  • ASE Certified Mechanic
most likely there is a exhaust leak before the sensor, or there is a vaccum leak after the MAF sensor or a failing maf sensor.

a o2 sensor that is bad could cause this also, but are a bit more expensive to check then the ones i listed above.
Jul 17, 2008 at 6:24 PM
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