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Any suggestion on these codes?


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I had these codes for couple of months but I had a beater to drive so didn't check them out right away.

I had the light on when I was driving on the highway. Took it to a shop which my friend recommended that

deals with porsche and they gave me these two codes.

P0430 : Catalyst Efficiency Below threshold Bank 2.

P0447 : Evaporative Emission Control system vent control circuit open.

I would like to know if anybody had these two codes and have any suggestion to them.

Thank you!

-JuiL-

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Ok p0430 number of things could cause this

1- bad, cheap gas

2- canister located up front wheel well could be going bad

3- catalytic converter itself is bad

P0447

1- loose gas cap

2- if car has been siiting & ideling too long

3- Cheap gas? lol

I had these codes for couple of months but I had a beater to drive so didn't check them out right away.

I had the light on when I was driving on the highway. Took it to a shop which my friend recommended that

deals with porsche and they gave me these two codes.

P0430 : Catalyst Efficiency Below threshold Bank 2.

P0447 : Evaporative Emission Control system vent control circuit open.

I would like to know if anybody had these two codes and have any suggestion to them.

Thank you!

-JuiL-

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  • Admin

P0430 TWC Conversion, Bank 2 – Above Limit

Potential causes:

– Catalytic converter

In the case of a catalytic converter fault in the Boxster (2.7 liter and 3.2 liter), only the pre-catalytic converter is to be replaced.

P0447 EVAP Canister Shutoff Valve (Output Stage) – Open Circuit

Potential causes:

– Wiring harness

– Shutoff valve

– DME control module

This one could also be a a loose gas cap or bad o-ring on the gas cap.

I would find the leak in the EVAP system and reset the codes. Then see if the cat code comes back.

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  • 2 months later...

Thanks Loren and juniinc. I've been working on other stuffs on the car like fixing the horn and cleaning the throttle body.

Now I can focus on getting rid of these codes.

For the code P0430, is there a way for me to tell if the Pre-catalytic converter is bad? Also, where is it located?

For the code p0447, where is the EVAP system located? and how to tell if there is a leak?

One more thing, I've been having problem with filling up with gas. Gas shoots out of the hole. Fuse is not blown and I also hear the click from the flap.

Could these codes cause the gas to shoot out?

Thanks!.

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Since I love to work on my car, I thought it would be good for me to get OBDII scanner.

It is a Multi Protocol Scantool Unit with USB connector.

The seller also gave me few softwares to work with and I'm using Digimoto 4.03.

Problem is that there are so many numbers and things which I'm not familiar with.

Here is a screenshot of the program that I am using.

(I think I took this screenshot while idling.)

post-21861-1202975662_thumb.jpg

Things that I would like to know are

Calculated Load Value

Short/Long Term Fuel %

Ignition Timing Advance

Absolute Throttle Position

O2 Voltage Bank One/Two Sensors

I have 1 CEL code left which is P0447 (Evaporative Emission Control System vent control circuit open)

I couldn't find any leak from the Canister (Inside the right front wheel wall?)

Should I look for specific numbers or sensors in the screenshot?

Thanks so much for all your help.

Sean.

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Just to give updates, both of my CEL codes have been disappeared.

I did two things that may or may not be relevant to the codes I have but here they are

1. I cleaned my Throttle Body

2. Bought new Gas cap (My old O-Ring had multiple cracks and it was basically flattened)

I cleared both of codes and have been driving for about a week now and no CEL!

Ever since I got my boxster, I have had CEL light on and it feels so good to not have them.

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