1998 Chevy S-10 Emission system problem

1998 CHEVROLET S-10
130,000 MILES • 4 CYL • 2WD • AUTOMATIC
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CBISSELL2001
  • MEMBER
  • 1 POST
I am getting a trouble code of P0440, which is saying that the emission system is malfunctioning. That doesnt tell me anything. I replaced both O2 sensors and the catalytic converter and the evap canister. So why am I getting this code. All help will be greatly appreciated.

Thanks
Chris
Aug 28, 2008 at 11:58 AM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
check for a vaccum leak or a crack hole past the MAF sensor or a dirty maf sensor first off all could be causing that condition, also a exhaust leak before the sensors could cause that.
Aug 28, 2008 at 2:31 PM
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