Hello, so I purchased a 2006 X-Type Jaguar in the middle of March. It has a little over 175-176 thousand miles on it and just replaced the spark plugs. I reset the check engine light that came on because of the emissions for the spark plugs and started driving again. Last night a check engine light came on, on flat ground and it hasn't been on for weeks. I went up and checked the codes using a code reader and it said that my catalytic converter was going funky.
I haven't seen any lack of performance and didn't even notice anything regarding it. I asked a friend and he told me just to ignore it, that it's just going to put out some bad emissions. If it's actually even doing that, he said that it could be set to California's emission settings or something, so it might be fine just not compared to California's standards? Anyone confirm this?
Also, my car says to use PREMIUM gas only, but I never have. Do you think that might be why it's throwing the code? Because I always just use I think it's 83? Or whatever the lowest quality of gas is. Do I actually need to be running the premium gas?
Clarification: What code(s) are you getting with your scan tool?
It could be a problem with your O2 sensors, particularly the downstream sensor that checks catalytic converter operation.
Uhm, I don't quite remember, it was my friend that checked them out. Let me see if he remembers, sorry about that.
Just checked with him and he didn't remember the specific codes. But he did say "I do remember that it was stating a catalyst deficiency."