2001 Saturn L100 Code Reader Gives P0171 Blank On Bay1 Both Ac Rad Fans Switch

2001 SATURN L100
142,000 MILES
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TOR_SATURN_L100
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The code reader gives a P0171 (blank on Bay1) code and both the AC and rad fans switch on, the car is running very high on gas and a black smoke, all started after it was in the workshop and the mechanic welded the exhaust manifold (that had a small crack). Already changed the temperature gauge and the FCM and no change. Please advise where to start, Can it be a bad sensor causing the problem?
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Feb 14, 2013 at 7:24 PM
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SATURNTECH9
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You have the 4cyl engine?The first thing I would do is check for a vacuum leak.
Feb 15, 2013 at 3:06 AM
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