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help! random P0420 with P0446

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Old 06-14-2019, 02:45 AM
  #11  
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Originally Posted by _zebra
well, that P0446 has been intermittent for the last year or so again... usually when getting below 1/2 tank of gas.
truck ain't hard to fill up or nothin. any thoughts?
The Evap monitor runs between 15%-85% fuel level. As for the cause, well it could be a few things.
Would need to do some component testing but it's probably the pressure sensor.


P0446 Causes

  • Missing fuel cap
  • Defective or damaged fuel cap
  • Defective Evaporative Vent Valve
  • Distorted, damaged or cracked Fuel Tank Filler Neck
  • Torn or punctured Evaporative system hose(s)
  • Defective Fuel Tank Sending Unit gasket or seal
  • Split or damaged Carbon Canister
  • Defective fuel tank pressure sensor
  • Defective or damaged fuel tank
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Old 06-14-2019, 07:31 AM
  #12  
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thanks, man. now just to find time to check any of those.
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