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Black smoke and O2 sensor low voltage

posted by  jol on  Sun Jun 13 02:38 CST 2004
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Hello,
My wife has a '98 V70 AWDturbo. CE light went on 2 weeks ago. OBDII scanner read P1031- O2 sensor Low voltage. Sensors are no more than 2 years old. 4 days ago car started blowing lots of black smoke.

My questions:
the order of diagnosis is: Check vacuum lines, check MAF connector, before replacIng O2 sensors?

What are other sources for the low voltage code? I want to check for other causes before buying another set of O2 sensors, since these are relatively new.

What are the chances that the MAF is bad-- how do I check this?

Jol






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