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Old 12-09-2021, 08:55 PM   #9
trottida
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Join Date: Oct 2005
Location: North of North of Toronto, Northern Ontario, Canada
Posts: 2,994
 

1999 SL2
2001 SL1
Default Re: P0131 code with hesitation when accelerating and poor gas mileage

Quote:
Originally Posted by cplvan View Post
I replaced the ECTS and the wiring looked fine and no corrosion. The problem is still there. Do you recommend replacing the bank 1 sensor 1 o2 sensor?
Has the temperature increased at full operating temperature? The first step is to remove the root cause and get your operating temperature where it should be. The second step is to resolve the secondary issues caused by the root cause. Let's confirm the issue from step 1 is resolved.
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1999 SL2 MT (299,400 km @ 11/2021)
2012 Ford Focus SEL HB MT
2011 Suburban LT

Past Saturns
2001 SL1 MT (438,500 km 11y)
1993 SW2 AT (10y)
2001 LW200 MT (3.5y)
1992 SL2 MT (5y)

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