Hi,

After putting on a berk 63.5mm high flow cat I started getting the bank 1 sensor 1 engine code. I'm not sure if it's a coincidence or not.

Can someone tell me if this part would fit on the forward sensor and if it would eliminate the issue?

https://balladesports.com/products/o...31806531436603

 

Dont put these on first sensor, it measures fuel, they are for the HFC, secondary sensor i have one on mine.

 

Would putting it on the second sensor clear the engine code?

 

What is the code number?

Bank 1 sensor 1 is in the header. Sounds like you have a damaged sensor.

 

P0420

 

I found this post. Looks like some answers in there should solve my issue. Sorry for posting my issue when this other thread already exists.

https://www.s2ki.com/forums/s2000-un...1174894/page2/

 

Do you need a new cat, re: P0420 CEL?

Thanks!

 

P0420 is a code for catalyst below efficiency

You have a HFC. So it makes sense to have that error code since HFC's don't clean exhaust gasses very well.

1.) Why do you have a HFC?
2.) You can use an angled O2 spacer on the secondary O2 sensor (the one that's in the CAT) to fool the ECU and the code will clear away. However, you will fail a visual emissions inspection, if that applies.

 

1. Good question. I don't really need one. I will probably put the original back on.
2. Thanks for this info.

I emailed Berk about this and here is what they said:

"For best results, you will need to RESET the ECU's fuel trim values. This is different than clearing the code only. You didn't mention the code specifically but from your description I think you have a P0420 or P0430, or both.

That code does not have any effect whatsoever on the drivability of the car. That code is coming from the rear O2 sensor in the cat itself, which is a narrowband oxygen sensor. The only purpose of that sensor is to monitor the cat. If you were to break it by smashing it with a hammer, you would have a code, but the car would still drive exactly the same.

I suggest that you take your scan tool and do a ECU reset to clear the fuel trims on the car. Your ECU "learns" over time and you will see a value represented as a percentage, called a short term fuel trim and long term fuel trim. This number will typically be +/- 20%. You will want to use your ECU scan tool to reset these values back to 0%, THEN clear the code."