So a couple weeks back one of my cats were cut off in the night. Super annoying. So, I ran it down to the muffler shop to see about a repair. It was going to take a couple days to get the converter and patch it in, so I had the shop cut off my other one and weld in test pipes to get me by until I could get the right parts.

This is where it gets interesting. I was expecting an engine code and poor fuel economy because that’s the common idea. No light. No code. Good fuel economy. Hmm. I guess my ecu doesn’t care.
BTW, it’s a ‘99 D1 V8

 

That’s interesting.

 

That sucks about the stolen cat but interesting about no faults.

 

yeah. the ECU on the D1s is pretty forgiving. you might even see better fuel economy since there is less restriction.

 

My 95 & 97 D1's both have the cats removed. Both had cheap aftermarket units on them when I bought them & both failed shortly after buying them. The 97 is my main off road D1 so I had them removed. It will only set 2 faults for O2 sensors after idling for a decent amount of time. The 95 only has 2 O2 sensors and never sets a fault. I have noticed improved HP, throttle response, and I lIve in a non OBD2 part of TX.

Sorry but with the way people are stealing them I have no plans on re-installing cats on my D1's.

 

The catalytic was stolen from my ‘99 and I’m debating if I can go catless since I’m in FL. This thread really helps, but wondering if the O2 will get triggered. Thought?

another issue is that the anti-theft alarm isn’t letting me turn the car on and I can’t find the code. Has that happened to anyone? I called LR USA and they said to take it to the dealer to have them get the code, so I need to tow it there. I’m hoping they’ll get it fixed and I can get the car started again

 

I had an 01 Dakota that I ran without Cats for a number of years. It would throw a code once or maybe twice a year, which I would clear and carry on.

 

I deleted my 98 d1 cats years ago, I welded the down steam o2 bungs shut and welded a sleeve and nut there, screwed in the downstream o2 and all good no codes, i know ive seen people claim the used the spark plug non fouler extensions so as not to modd the pipe but I couldn't find ones with correct threads

 

On my Dakota I used spark plug non foulers to keep the downstream sensors out of the main exhaust stream, but I think our LR O2 sensors are an oddball thread.