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Bank 1 Malfunction

  #1  
Old 01-07-2009, 02:54 AM
Thread Starter
Join Date: Oct 2008
Posts: 6
Default Bank 1 Malfunction

i have a code P0170....FUEL TRIM MALFUNCTION (BANK 1) can anyone explain this code.....need to pass the smog check
 
  #2  
Old 01-07-2009, 07:58 AM
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Join Date: Aug 2007
Posts: 1,324
Default RE: Bank 1 Malfunction

The o2 sensors constantly switch the fuel mixture from rich to lean above 2400 rpm to achieve 19.7 to 1 air/fuel ratio. If an o2 sensor is lazy and slow to switch it can kick this code as well as a vacuum leak/dirty injector etc.
 
  #3  
Old 01-09-2009, 07:11 AM
Thread Starter
Join Date: Oct 2008
Posts: 6
Default RE: Bank 1 Malfunction

thanks Hixx........ i will check all the lines and change my O2 sensors......van is 11 years old I guess its about time to replace the O2 sensors.....can I use a universal type sensors ?
 
  #4  
Old 01-09-2009, 02:09 PM
Senior Member
Join Date: Aug 2007
Posts: 1,324
Default RE: Bank 1 Malfunction

Yes the aftermarket sensors are fine.
 
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