podrae 0 Report post Posted April 18, 2017 Hi Guys I have been having an issue with my 2003 318i for a year now where it makes this horrible rattling sound when cold, It sounds exhaust related but with the help of some mechanic friends we have failed to pin point it. recently the engine light came on and the code came back as a catalytst efficiency threshold issue p0420. It occurred to me that my issue is almost certainly a busted Cat causing the noise. I have been looking around on Google and have found that its possible to remove this entirely which as I understand wont fail a wof in NZ. From what I can find this was straight forward on older models but is hard if not impossible to do on newer models with front and rear 02 sensors. What I am wanting to clarify is if doing this will create any ill effects including triggering error lights / codes.... Thanks Quote Share this post Link to post Share on other sites
HaNs 226 Report post Posted April 18, 2017 Gut it and run a o2 spacer or mini cat spacer on the 2nd sensor. Or I can disable the fault in the ecu if that doesn't suit Quote Share this post Link to post Share on other sites
podrae 0 Report post Posted April 18, 2017 Ok so it is possible to get around it, I would be coming to see you but unfortunately im at the other end of the country Quote Share this post Link to post Share on other sites
HaNs 226 Report post Posted April 19, 2017 4 hours ago, podrae said: Ok so it is possible to get around it, I would be coming to see you but unfortunately im at the other end of the country We can get around that, but first try this http://www.redlineperformance.co.nz/products/exhaust/o2-oxygen-sensor-spacer/o2-oxygen-sensor-spacer-with-mini-cat/ Quote Share this post Link to post Share on other sites
zero 1160 Report post Posted April 19, 2017 How many kms on the car? Quote Share this post Link to post Share on other sites
podrae 0 Report post Posted April 19, 2017 148000 Quote Share this post Link to post Share on other sites
