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Ron Z.
Ron Z., - Toyota Tech -
Category: Toyota
Satisfied Customers: 18694
Experience:  18+yrs experience. State Inspector and Toyota Diagnostics
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1998 Toyota Camry: check engine light..codes are p0420 and p0441.

Customer Question

I have a check engine light on a 1998 Toyota Camry. The codes are P0420 and P0441. What would you suggest?
Submitted: 5 years ago.
Category: Toyota
Expert:  Ron Z. replied 5 years ago.

Welcome! I'm Ron Z! I will do my best to answer all of your questions. For easy access to this thread, bookmark it now! Please read everything!


Looks like you may have two different problems here.


The P0420 is fairly straight forward pointing to a failing Catalytic Converter. The oxygen sensors measure the amount of emissions in the exhaust going into, and then out of then out of, the Converter. When they see the converter isn't "cleaning" the exhaust enough to meet specs, the converter is deemed" below threshold" and the P0420 is set. Most commonly, the converter will need to be replaced in the near future.


The P0441 is actually a "known problem" and Toyota has issued a Techincal Service Bulletin, with the correct repair for P0441:


Repair Procedure

Diagnostics for PO441:

  • -Remove Vacuum Hoses between EVAP VSV and Charcoal Canister and discard
  • -If there is a metal vapor pipe between EVAP VSV and Charcoal Canister, clean inside of vapor pipe
  • -Replace EVAP VSV and Charcoal Canister assembly with new parts
  • -Install new vacuum hoses between EVAP VSVand Charcoal Canister


Ron Z. and 4 other Toyota Specialists are ready to help you
Customer: replied 5 years ago.
Where are the EVAP VSV and charcoal canister located?
Customer: replied 5 years ago.

This being a known problem, is it covered by Toyota?

Expert:  Ron Z. replied 5 years ago.
Unortunately, due to the age of the vehicle, no, it's not covered by Toyota.