MaxRider

2021 Lexus LX Diesel: Discussing Potential DPF Regeneration Failure and Related Issues

Hey! I've got a 2021 Lexus LX with a Diesel engine and already ran about 82625 km. Lately, it's been feeling off - check engine light's been on, engine's been unsteady, there's even drop in power. Been noticing black smoke on acceleration and the fuel economy's gone downhill. I'm thinking there's a DPF regeneration failure issue or maybe the differential pressure of the diesel particulate filter is too low. Had a real nightmare at the mechanic recently, so before I take it back, did anyone else experience something similar? Any insights on what the problem could be or feedback on your own mechanic experiences would be really appreciated. Thanks!

4 comment(s)

Hey! I totally get where you're coming from. Recently, I faced a similar problem with my 2018 Lexus LX. My beast had the check engine light flashing, lost power, rough riding - pretty much the works. It totally killed my vibe. Turned out the exhaust back pressure sensor was on the fritz. It's like the brain of the exhaust system and communicates with the engine computer. When it went haywire, it messed up the engine's performance, caused back pressure inconsistencies, and led to black smoke. Honestly, it was quite a serious issue. The longer it was ignored, the more damage it could cause. But sure enough, once that sensor was replaced, things went back to normal. No more smoky emissions, power loss, or poor fuel economy. So, before you dig too deep into the DPF and other theories, you might wanna check out this angle. Best of luck!

Hey there, Thanks heaps for sharing your experience! It sounds like you have been through quite a bit with your Lexus LX too. Your problem seems to fit pretty well with the cues my Lexus LX is giving me. This thing with the exhaust back pressure sensor definitely got me thinking. I just wanted to know, how much dough did you need to part with to get that sensor replaced? And since you had it sorted, did anything else pop up or is your ride running smooth? Cheers!

Hey! Good questions! I had to shell out around 250 Euro to get the exhaust back pressure sensor repaired. A bit of a dent on the old wallet, but I reckon it was worth every penny. About your second question, since my sensor was sorted, everything's been running like clockwork! Funny you should mention the differential pressure of the diesel particulate filter, as that was an issue I had before seeing the mechanic. But it got sorted along with the sensor. So, to answer your question: since getting it fixed, the ride's been smoother than a hot knife through butter, no new problems! Hope that puts your mind at ease a bit. Good luck with your Lexus!

Hi! Thanks for replying swiftly and sharing this vital information, it sure does clear some clouds! It's comforting to hear your Lexus is now smooth sailing. I suppose around 250 Euro isn't that bad considering the hassle it's causing me. The sensor issue completely makes sense. Definitely going to keep your experience in mind the next time I see my mechanic. Also, hearing that your differential pressure got sorted gives me hope. Fingers crossed my ride will soon be purring like a kitten again! You were a big help. Cheers!

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