samanaslt

Ok, will try to go for fixing exhaust. After all it was picked up on MOT, however on normal visual inspection we could not see any soot. On app it reads as OBDII: Catalytic converter system, bank 1 - efficiency below threshold. Which side is that? Also any suggestions for that rough idle?

Hello, for a while I have started to get p0420 code. After removing it with OBD reader it will appear again at random intervals, mainly when doing longer journeys. Intervals can be random 800 miles to 60 miles and so on, just random. Might appears more often when engine working harder like on North wales roads. Any ideas what that could be? On MOT done last year November it says there is small exhaust leak, could that be the case? Also, not sure if problem is related, but sometimes I am getting rough idle where rp falls bellow 700 rpm, and car doesnt feel very smooth, on rare occasions it goes to 500 rpm or even 400 rpm (only had that at cold winter morning before changing spark plugs) and car start to shake. It doesnt happen all the times, noticed it occurs more often on humid days, and colder humid mornings. I have cleaned valve throttle body and changed spark plugs. While ECU is learning there was no rough idles, but soon after learning it start to rough idle again. Any ideas? BTW, car got around 120k miles. Thank you.

It's all sorted now. As I mentioned this Lexus doesn't have optional 'Park Assist' (as shown in manual) installed, however it does have LPA400 (Lexus parking assist) installed, possibly by previous owner. After finding manual on internet, manual mentions that 'optional button' to disable system can be installed in the trunk. After taking a look I found a button in the left side of a trunk, probably got pressed accidently when I was on a trip with fully loaded trunk. I must say it's a terrible place for a button. Anyway everything is working now.

I believe my car doesn't have park assist (I only have reverse proximity sensors with beeper, no visuals whatsoever), I never had that light and it was working, same on 220d I had, there was reverse proximity sensors but no P light.

Hello, got Lexus Is 250 SE auto. Got a problem that sound from reversing beeper dissapeared. It was working all fine, and then suddenly after a trip it doesn't work. I've only got reversing proximity sensors and it was emitting beeping noise closer I was getting to obstacle, also there was a beep sound when I put car in reverse, it doesn't do that sound either. I don't have navigation screen, radio works, and I never had green P light, and I don't see option to turn parking sensor on satellite switch. Any ideas what happened? Is there specific fuse to check? Thank you.

Could some sort of HG sealant help out on 220d with situation I have? Perhaps it's a small leak?

Done chem test on coolant reservoir, yes fluid changed colour to green. Exhaust gasses getting in somewhere into cooling system. Can it be EGR cooler or anything else. Or only answer is HG? How to know for sure?

Yeah, but if that would be a head gasket, would it not being showing any other symptoms in those 6 months I've been driving? Also sometimes I can hear some bubbling sound behind dash when starting car, but after opening coolant bottle cap sound disappears for a week, and then it reappears.

Hello, I have an issue with my IS 220D, 08 plates, 117k miles. I bought car November 2018, only problem I noticed is that coolant is leaking through overflow pipe on coolant reservoir tank. Higher revs on engine, higher coolant goes in coolant tank till it overflows. And just usually spills out till it just below low line. After reading these forums back in December, I went to do head gasket test. Test came clear and they just recommended me to change cap. Bought brand new genuine cap from dealer, problem still exists. I've been driving car everyday since November around 5k miles, coolant temp always just bellow middle, never attempted to overheat, no smoke, no mayo on cap, no warnings on dash. It never been issue except that it splashed coolant all over engine bay. Can somebody please explain to me what's happening, because local garages have no clue. Thank you.