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Old 06-01-2010, 11:41 AM   #16
WhyHelloOfficer
Scooby Specialist
 
Member#: 193989
Join Date: Nov 2008
Chapter/Region: South East
Location: Tampa, Fl
Vehicle:
2007 Stormy Blue
Blown Roadster

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Quote:
Originally Posted by alx8283 View Post
ill be running v1 accessport 91 octane stage 2, if i plug the bung, will the ap make everything bueno?
There isn't a magic button on the AccessPort that will let you disable the Rear O2 sensor. You will need a specific map to disable it.

From the Downpipe FAQ:
Quote:
Originally Posted by Unabomber
What is the CEL fix? It stops the rear CEL code P0420 Catalyst System Efficiency Below Threshold from appearing, this code being caused by the lack of a catalytic converter in the exhaust. This is usually fixed with a Pony Express MIL Eliminator (no longer in business), Casper Electronics fix, or Perrin Performance fix. The 05+ does not currently have an electrical fix. Another fix is the mechanical fix, which works on all models.

***NOTE*** There are two CEL fixes for the WRX, the other one is the 2.2 KOhm 1/2 watt resistor. It is used to combat the CEL code P0546 = Exhaust Gas Temperature Sensor Circuit Malfunction (High Input) in the uppipe. This notice, though not important to this thread, acknowledges there are two "CEL fixes" and defines them individually to avoid possible confusion.

Many aftermarket engine management systems can also be used to prevent the CEL light from showing up.

Which is the best CEL fix, mechanical or electrical? Both work fine, though personnel living in states with OBDII testing prefer the mechanical fix. The reason for this is during state mandated OBDII testing, the electrical fix can show up as a malfunctioning sensor. For some states, this one malfunctioning sensor is fine, for others, you will have to fix it and return. In the end, the mechanical fix is cheaper and easier for most users.

Can I drive around with a P0420? Yes. This is not a code that will throw your car into limp mode, so you can drive normally with it until you get a CEL fix. It's never wise to do so though as a CEL is easily seen by police who may then do a "safety inspection" as well as cause issues during any local emissions testing.
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