Land Rover DPF Fault Killing Power, Fix Discussion

Hey there! Your symptoms sound familiar. I had a similar issue with my 2006 Land Rover LR3 (4.4L V8) last year. Just to note, your Discovery being a gas engine shouldn't have a DPF system, as those are only found in diesel engines. The power loss and check engine light in your case might be pointing to a different issue. In my case, the power loss was due to a clogged catalytic converter and faulty oxygen sensors. Got it checked at the garage, and the diagnostic showed high exhaust back pressure. It was quite serious since the clogged cat was restricting exhaust flow and could've caused more engine damage if left unchecked. They had to replace the catalytic converter and both oxygen sensors. The car's been running like new since then, and the power came back immediately. Suggest getting a proper diagnostic done, the symptoms you're describing could be exhaust system related rather than DPF issues. Hope this helps.

Thanks a lot for sharing your experience! Really good to know about the catalytic converter, that definitely sounds similar to what I'm experiencing. Just curious, do you remember roughly how much you ended up paying for the whole repair? And has everything been running smoothly since then, or have you noticed any other issues popping up?

Hey again! Thanks for asking about the follow-up. Actually, after seeing my mechanic last week, they confirmed it was indeed the exhaust back pressure sensor that was faulty, just as we suspected. Had it fixed along with the severely overloaded DPF, set me back 1,325.00 € in total. Bit of a hit to the wallet, but honestly, it was worth every penny! The LR3's running like an absolute dream now, got all that power back and she's purring like a kitten. No more check engine light either, which is a massive relief. Been driving it daily for the past week and haven't noticed any other issues popping up. One thing I learned from all this, don't wait too long if you notice power loss. The sooner you get it sorted, the less likely you are to face bigger problems down the road. Really glad I got it fixed when I did! Let me know if you end up getting yours checked out. Would be interested to hear what they find!

Thanks for the detailed update! After reading about your experience, I finally took the plunge and went to a mechanic. Turns out my initial guess about the DPF was completely wrong, you were spot on about it being a gas engine issue! The mechanic found a badly clogged catalytic converter and a faulty oxygen sensor. Got both replaced, and honestly, what a difference! The engine's got its punch back, and that annoying check engine light is finally off. Cost me a fair bit, but the car feels like new. Funny how I was so worried about finding a trustworthy mechanic, but this new place really knew their stuff. They explained everything clearly and even showed me the old parts. No more mysterious noises or power issues! Really appreciate everyone's help here, sometimes you just need that little push to get things sorted. Lesson learned about not putting off these repairs too long!