Bad O2's/Misfire/MAF/ woah whats happening
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Bad O2's/Misfire/MAF/ woah whats happening
Hi All,
I recently purchased a 2004 Disco 2 with about 95k on the clock. All was well for about 2 weeks then got the 3 Amigos (luckily it was a wheel bearing). Another good week goes by, and CEL comes on. It throws a code for O2 Sensors too lean ( P0174, P1174). I take it in with new O2 sensors from Atlantic British. The shop mentioned to me "You had the upstream sensors in the downstream and visa versa". So they put the new sensors in along with a MAF sensor and it ran well (honestly the best its run for the last two months I've owned it. A couple MORE weeks go by and the CEL comes back on... At this point I don't see much of a change in drivability so honestly I ignored it until I was able to find time to drop it off.
Now here we are... May 2nd 2026 and the thing starts going wonky. I started it up one morning and as I was pulling out the CEL starts flashing (misfire, f**k). As I got up to about 35mph the vehicle starts shaking with acceleration. It turned into a CRINGE level misfire.
My O2 codes come back up again with P1174 and P0174 along with misfires in 1,2,3 cylinders and random misfire. My trusted mechanic is out for 3 weeks and I need a car. (I do daily my Disco)
I'm novice but able to do repairs and have just about every tool - just not the time. Should I look for a vacuum leak? Should I replace the plugs? Should I look at the injector O rings? Should I swap my O2's?
Please ask away and happy to take any advice.
Sam
I recently purchased a 2004 Disco 2 with about 95k on the clock. All was well for about 2 weeks then got the 3 Amigos (luckily it was a wheel bearing). Another good week goes by, and CEL comes on. It throws a code for O2 Sensors too lean ( P0174, P1174). I take it in with new O2 sensors from Atlantic British. The shop mentioned to me "You had the upstream sensors in the downstream and visa versa". So they put the new sensors in along with a MAF sensor and it ran well (honestly the best its run for the last two months I've owned it. A couple MORE weeks go by and the CEL comes back on... At this point I don't see much of a change in drivability so honestly I ignored it until I was able to find time to drop it off.
Now here we are... May 2nd 2026 and the thing starts going wonky. I started it up one morning and as I was pulling out the CEL starts flashing (misfire, f**k). As I got up to about 35mph the vehicle starts shaking with acceleration. It turned into a CRINGE level misfire.
My O2 codes come back up again with P1174 and P0174 along with misfires in 1,2,3 cylinders and random misfire. My trusted mechanic is out for 3 weeks and I need a car. (I do daily my Disco)
I'm novice but able to do repairs and have just about every tool - just not the time. Should I look for a vacuum leak? Should I replace the plugs? Should I look at the injector O rings? Should I swap my O2's?
Please ask away and happy to take any advice.
Sam
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