Question about 2003 Buick Regal

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2003 Buick Regal Service Engine Soon light.

2003 Buick Regal V6, 160,000 miles on it; Service engine light had come on & per recomendation of mechanic: we changed the plugs, plug wires, & PVC valve. Also (since it was due) changed the oil, filter & fuel filter. Still ran rough so had it checked agian & had the cat converter changed. Drove it for 3-4 days & the service engine light came on again, (stays on) had it 'read' & error code P1133-MFR control-fuel+air metering. What part is this & were is it located?

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The error that I'm showing for error code P1133 is 
P1133 Heated Oxygen Sensor (HO2S) insufficient switching bank 1 sensor 1(Rear Bank).  I would suggest having both of your Oxygen Sensors replaced if you haven't already had that done.  Hope this helps.  Thanks for an honest rating and for using FixYa.

Posted on May 19, 2009

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I'm having the service engine soon light come on my 2003 too, the driveability is in A1 condition. Is it possible its the gas cap sealing? because I can see signs of cracks on the cap rubber seal.

Posted on Aug 28, 2010

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