Hi,

I had a couple of fault codes in my 2005 Skoda Octavia vRS with respect to O2 Sensor.

On a suggestion from my mechanic, i removed the catalytic converter. still the fault codes were recorded.

After a few trial & Errors, i did order a new O2 Sensor from EBay and the fault codes were gone.

after driving for about 100 kms (i Live in India), the CEL came up and VCDS pointed out to 16804.

my question here is

1. Is this Fault a result of me removing the Cat-Con?
2. do i have to do any ECU Coding to let the system know that i have removed the Cat-Con?
3. Will Fitting a Spacer for O2 Sensor Bank1 - Sensor1 solve this Issue?
4. Is this issue due to the second O2 Sensor? (I don't see any fault codes related to that)

Kindly help me in identifying the root cause so that i can solve this issue.

Along with 16804, a few other codes were also recorded. - 17705 & 18074

Thanks in Advance.

Regards,
Gurupprasad B

yes its because you have removed the catalytic converter  16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold

 

i have a 200cell sports cat and i had to remap my car to stage one so that i dont get any fault codes regarding the cat

 

i had the same faultcode as you have now before  i had it mapped out

Edited 21 March, 201610 yr by rsdanne

yes its because you have removed the catalytic converter  16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold

 

i have a 200cell sports cat and i had to remap my car to stage one so that i dont get any fault codes regarding the cat

 

i had the same faultcode as you have now before  i had it mapped out

Thanks a ton, rsdanne.

 

The hunt for a replacement cat has just begun. also looking for re-map options.

 

i have another question, may sound silly,

Is it ok to drive around without the cat and the CEL on?

I drove around like that för some weeks so i dont think it matters