Can I remove cats?

[Chuck996]

I have a 1999 cab == 3.4 engine. Can I remove my cats and run my car without any problems ?

I have a 951 that I removed the cat --- run a test pipe. Will it affect my computer - ie. the O2 sensors.

Thanks,

Chuck996

[gsieck]

The car will run fine, but you will get a CEL unless you plug the sensors into a bypass device. I've seen them around for race cars. When you go to smog the car, you'll have a problem

[Izzy]

Chuck, what year 951? The O2 sensor could be upstream from the cat and is not a problem

[Chuck996]

Izzy

I have owned a few --- the current 951 is a 90,000 mile 1987 with very nice upgrades. Will out run my 996.

Thanks,

Chuck996

[Loren]

The car will run fine, but you will get a CEL unless you plug the sensors into a bypass device. I've seen them around for race cars. When you go to smog the car, you'll have a problem

You could also re-program the DME to use the RoW program (which ignores the 2nd O2 sensors).

Of course, you would not pass any US smog tests.

[ahamay]

The car will run fine, but you will get a CEL unless you plug the sensors into a bypass device. I've seen them around for race cars. When you go to smog the car, you'll have a problem

You could also re-program the DME to use the RoW program (which ignores the 2nd O2 sensors).

Of course, you would not pass any US smog tests.

Loren

i want to re-program my DME with ROW to get rid off the 2nd sensor p0139 code,but the dealer say it's not possibile(as far as i figured, he simplly don't know how to do it)

please advice

[Loren]

The car will run fine, but you will get a CEL unless you plug the sensors into a bypass device. I've seen them around for race cars. When you go to smog the car, you'll have a problem

You could also re-program the DME to use the RoW program (which ignores the 2nd O2 sensors).

Of course, you would not pass any US smog tests.

Loren

i want to re-program my DME with ROW to get rid off the 2nd sensor p0139 code,but the dealer say it's not possibile(as far as i figured, he simplly don't know how to do it)

please advice

It maybe illegal in your country - which maybe why a dealer won't do it. You are likely going around your countries emissions laws.

It is all about choosing the DME program. Depending on your model year there are usually 2 to 5 programs to choose from.

[ahamay]

The car will run fine, but you will get a CEL unless you plug the sensors into a bypass device. I've seen them around for race cars. When you go to smog the car, you'll have a problem

You could also re-program the DME to use the RoW program (which ignores the 2nd O2 sensors).

Of course, you would not pass any US smog tests.

Loren

i want to re-program my DME with ROW to get rid off the 2nd sensor p0139 code,but the dealer say it's not possibile(as far as i figured, he simplly don't know how to do it)

please advice

It maybe illegal in your country - which maybe why a dealer won't do it. You are likely going around your countries emissions laws.

It is all about choosing the DME program. Depending on your model year there are usually 2 to 5 programs to choose from.

Thank you Loren

here the emissions-admissions tests are not an concern.

the dealer simplly don't know how to do it.

could you please advice the exact operation wich is to be made trough the piwis?

i can try to print it and go to them and try to make it.

i am particullary interested also if there is a better version for my DME,i consider to remove the cat's if it's possibile and also i have read your statment that ROW DME programming will pass over the 2 oxygen sensor fault codes wich US DME display it,i have a p0139 fault code since last week

please advice

[Loren]

The car will run fine, but you will get a CEL unless you plug the sensors into a bypass device. I've seen them around for race cars. When you go to smog the car, you'll have a problem

You could also re-program the DME to use the RoW program (which ignores the 2nd O2 sensors).

Of course, you would not pass any US smog tests.

Loren

i want to re-program my DME with ROW to get rid off the 2nd sensor p0139 code,but the dealer say it's not possibile(as far as i figured, he simplly don't know how to do it)

please advice

It maybe illegal in your country - which maybe why a dealer won't do it. You are likely going around your countries emissions laws.

It is all about choosing the DME program. Depending on your model year there are usually 2 to 5 programs to choose from.

Thank you Loren

here the emissions-admissions tests are not an concern.

the dealer simplly don't know how to do it.

could you please advice the exact operation wich is to be made trough the piwis?

i can try to print it and go to them and try to make it.

i am particullary interested also if there is a better version for my DME,i consider to remove the cat's if it's possibile and also i have read your statment that ROW DME programming will pass over the 2 oxygen sensor fault codes wich US DME display it,i have a p0139 fault code since last week

please advice

Your model year and model car please?

[ahamay]

2002 3,6 carrera 2

[Loren]

2002 3,6 carrera 2

One warning - if you are in Germany and the car is built to Germany specs then you could damage the cats by running this program change.

Since you are not replacing the DME the old codes and new codes will be the same.

Programming

1. Connect and switch on the Porsche System Tester 2 and switch on the ignition.

2. Select 911 (996) in the Vehicle type menu.

3. Select DME in the Control unit menu and press the double arrow key [»].

4. Select Program control unit in the DME function selection menu and press the double arrow key [»].

5. Select "Read control units" and press the double arrow key [»].

6. Select Program control unit in the Control unit programming menu and press the double arrow key [»].

7. Ensure that all requirements requested on the screen are fulfilled and then press the double arrow key [»].

8. The following message appears on the screen: "Input Vehicle Ident. Number". Input Vehicle Identification Number and press the double arrow key [»].

9. The following message appears on the screen: "Please confirm input" Confirm input with the [F7] key.

10. The following message appears on the screen: "Input old DME programming code" Input DME programming code and press the double arrow key [»].

11. The following message appears on the screen: "Please confirm input" Confirm input with the [F7] key.

12. The following message appears on the screen: "Input new programming code" Input new DME programming code and press the double arrow key [»].

13. The following message appears on the screen: "Please confirm input" Confirm input with the [F7] key.

14. The following message appears on the screen: "Input new immobilizer code" Input immobilizer code and press the double arrow key [»].

15. The following message appears on the screen: "Please confirm input" Confirm input with the [F7] key.

16. The following message appears on the screen: "Select data record" Select data record according to the allocation table and press the double arrow key [»].

At this point choose Euro 2

The control module will now be programmed. Programming will take approx. 5-10 minutes.

Warning: Never interrupt the programming process

17. The following message will appear after the programming time has elapsed: "Programming was completed successfully" Press the double arrow key [»], switch the ignition off and then on again.

This completes programming of the DME control module.

[ahamay]

thank you and appreciate your support.

the row dme programm should be stored in the piwis,this is corect?i ask this becuase i did not dee wich operation is to select the row dme programinng to be inputed

my car is us model this is for sure.

also you said that there are several programms for my car to choose.what is your opinion?should the x51 dme be an option?or the newer 05- 997(with325hp)?or the gt3?i'm very curious if this is an option but not sure if they will "fit" into my motronic..

another issue is that i have look over the 2nd sensor for bank 1(driver side wich actually end on passenger side) and surprise.

on both pipes after the exhaust mainfold is only one.is the "before cat "sensor,so there is only 2 sensors and not 4!!

do you think that on my model year is possibile that the 2 nd sensors to be located somwehre else?on the porshe diagram parts i have seen them related to be on the straight pipe after the cat

based on the p0139 code i have made a search and found have found a nice deal for 996.606.178.01 sensor but i can not locate him so far(item number 30 in the image)

i repeat,on the straight pipes after the cat there is no sensor at all!i have just look for 30 min in that area from the cat untill the exhaust canister.

Edited April 6, 2009 by ahamay

[Loren]

Yes, the programs are in both the PST2 or PIWIS testers.

You can only select from the ones on the list for that model year - so 997 programs etc. There is likely a 3rd party way of putting a newer program in the car but you do not have the newer engine parts in your car.

The sensors and cats on your car will be dependent on the country your car was built for and sold into (and their specific laws).

You have not told me either.

[ahamay]

Loren

the x51 dme is possibile?

could you brifelly describe the newer components in the 05-07 carrera 2?are they so important?

i assume that the 997 dme software is just an improvement of 996

i bought my car in los angeles 1 year ago

it is an us model as far as i can see(cluster in milles etc) but here is the vin: W POAA29922S620466

Edited April 6, 2009 by ahamay

[Loren]

Loren

the x51 dme is possibile?

could you brifelly describe the newer components in the 05-07 carrera 2?are they so important?

i assume that the 997 dme software is just an improvement of 996

i bought my car in los angeles 1 year ago

it is an us model as far as i can see(cluster in milles etc) but here is the vin: W POAA29922S620466

There are engine mechanical changes to make an X51 engine - much more than software.

They will have to look and see what the PST (or PIWIS) shows for options when they re-program it. I don't recall any programming changes for X51 - they will have ro see what options are available.

As you are now a Contributing Member you can read the Porsche Technik books that list the year to year model changes. They are in the Download section and the private forum for Contributing Members.

[ahamay]

i still can not figure where is the 2nd sensor located. :unsure:

[Loren]

Items 30 and 31 are the sensors - shown here on a US MY02 and newer exhaust.

31 is pre-cat and 30 is after-cat.

[ahamay]

i agree

just that instead of the after cat sensor( 30 in image ) the pipe is straight with no hole no sensor nothing.

do you think it is possibile to be in the exhaust end canister?

very curious since i get an fault code for this after cat sensor

.......

updated,here is the o2 sensor location

Edited April 7, 2009 by ahamay

[cwhaley]

Hi Loren,

Would these options be similar for a 99 996 with the 3.4l? If so, what else would the ROW option(S) offer in performance.

Thanks

[Loren]

Hi Loren,

Would these options be similar for a 99 996 with the 3.4l? If so, what else would the ROW option(S) offer in performance.

Thanks

http://www.renntech.org/forums/index.php?s...st&p=114967

I do not recommend this - unless you have a full time track car.

[cwhaley]

Hi Loren,

Would these options be similar for a 99 996 with the 3.4l? If so, what else would the ROW option(S) offer in performance.

Thanks

http://www.renntech.org/forums/index.php?s...st&p=114967

I do not recommend this - unless you have a full time track car.

It does seem to be turning into a full time track car. The full cage arrives next week (we'll be installing it just before the Zone 1 event on the 19th)... What changes to the throttle and engine systems map does the RoW effect... i.e quicker throttle response, higher rev limits, ?

[cwhaley]

So, is this forum only for the "Street Cars" any question that might be for a possible future PCA race car does not rate an answer.... The only way to advance Knowledge is to ask questions!

Edited June 7, 2009 by cwhaley

[logray]

14. The following message appears on the screen: "Input new immobilizer code" Input immobilizer code and press the double arrow key [»].

On a used DME unit, I am assuming "new immo" code would be the immo code on the used unit (not the immo code on your existing DME if you are replacing it with a used DME). Can anyone confirm this from Loren's procedure above? Thanks in advance.