Hi all, my gs450h has a blowing centre section exhaust, i assume its the original. The car has done 327k miles, yes you read that right. Occasionally the EML comes on, with error code p0420,
P0420 LEXUS Catalyst System Efficiency Below Threshold Bank 1
I can clear it, but it does come back after a few days, the problem is no doubt related to the blowing. Can these be got as used parts? Im struggling to find one. Do these have just the one CAT, or two?
By animus nocendi
My DPF is so blocked I have to avoid driving at busy times or the engine will cut out.
Can anyone recommend a decent company that can remove, clean and put the DPF back on?
Has anyone removed their DPF and cleaned it out?
My understanding is that they can be cleaned in one of the following ways:
1. In a device which pumps pressured air through it, then it's placed in an over at 600-800 degrees C for several hours, then air pressures through it again.
2. The Ceramix method where it's placed in water where ultrasound vibrates all the soot out, then pressurised air is pumped through to remove anything that is left.
3. Remove DPF or have garage remove it, then DIY - use a water pressure washer to remove all soot, dry then put in back in.
Any advice is appreciated. I'm not going to pay Lexus over £1000 for them to replace their faulty DPF. When I spoke to them they said that this happens on all diesel cars. Strange how it's never happened on any of my parents cars (X5 3.0d or E class (280d), or on any other family or friends vehicles.
Wonder if you could help, I have got the EML now being displayed on the dash. Have code read the fault and it has come back with P0420 'Catalyst System Efficiency Below Threshold Bank 1'. I know that this code can be triggered by many things such as an air leak in the exhaust, lambda sensors (but usually P01?? code is usually triggered) I have read the freeze frame data but im wondering if there is anyone that could understand the data more than what I can. From what I've read up on, the SHORTFT and LONGFT should be as close to 0 as possible. However from the freeze frame data you can see that the SHORTFT has a positive reading and the LONGFT has a negative reading where its trying to compansate and correct the fuel mixture.
What I am wondering is, from this freeze frame data, could someone diagnose where for me to start replacing parts. I'm hoping that this is just a lamda sensor issue, I have already replaced the pre cat lamda sensor on Bank 1 (Denso part no DOX-0236). Without this help, my next step would have been to replace the lamda sensor by the main cat (not sure of the Denso part number for post cat sensor), so that bank 1 has had a replacement sensor before and after the cat, to see if this clears the code. I know that I might need to replace the cat, but at this moment in time I am trying the cheapest option first to resolve the issue. But all of your opinions are welcome.
Here's the freeze frame data:
Other data from code reader:
I hope someone on this site can point me in the right direction.
I drove my 1995 ls400 into a flooded forde just before Christmas, took the spark plugs out and turned the engine and got the car going again, only problem now is that when the car is idling it jumps the revs, even when I'm driving the car would rev itself up and down, already tried a new air flow meter but no use, can anyone suggest anything else I could try? Thanks
Looking at buying a stainless manifold and high flow stainless cat.
Will fitting these put my engine managment light on? If so, how would i get around it?