on the HU, back there got 1 socket is from the steering buttons
use multimeter to check the pins, and press the buttons, make sure is the button not working and not the HU faulty

I just change Bosch Eco H7 lamp. There was no adjustment necessary & it's quite bright.

I've noticed my Proton Preve 2015 engine roar is worryingly loud when going downhill.The only way to reduce the engine noise is to manually upshift to higher gear or step on the accelerator. It is not comfortable to drive due to the loud noise and also dangerous as have to use accelerator and then brake quickly just before a sharp bend especially when going down Genting Highlands.

Is this normal?

I checked with SC and ask if anything to do with CVT i.e. wrong gear selection or update firmware but was told it is normal.

This post has been edited by henry@lyn: Apr 16 2023, 12:15 PM

that is engine braking, the engine will rev up and hold it about 3500rpm. shift into higher gear removes the engine braking and they way you drive is wrong.

Preve downhill engine braking sound is annoying one. Even when new it's loud.

improve the bonnet noise insulation. slope dont need to pedal gas let it be

for this engine noise and stupid decel engine noise, we asked Punch before, they say Proton purposely program the CVT that way, and they cannot help it

sometimes I just partial throttle and brake at the same time (God foot mode)

asked one soundproof shop, need lots of work to cut that noise, and even after that the result will only be so-so...

dont waste money la. already 10 years old car. spare part also getting lesser already. keep the cash for ur next car.

yeah, I think so too... still a decent car, but hold the budget for wiser decisions.

Hi guys.

1) Is it better to use one step colder spark plug on Preve turbo?

I've watched many Youtube explaining NGK spark plug heat range and it makes me wonder. Proton use NGK ILKAR7G7 which means heat range 7 according to NGK chart. And with the release of Civic turbo, they are using ILZKAR8H8S, which means heat range 8, correct?
For NGK, the higher the number, the colder heat range it will be. Youtube is saying boosted car is better with colder heat spark plugs. I know our Preve is not running high compression like Civic, but there are already sellers out there selling upgraded turbo for Preve. And my car has already been remapped.
Youtube also say if the spark plug heat range is too cold for your engine, it will accumulate carbon deposit and looking a bit wet.

Anybody tried to upstep their spark plug heat range? Is there any improvement however small? I saw a seller on Shopee recommends upstepping the spark plug heat range for Preve


2) What is the best ignition coil for turbo Preve anyway?

My car sometimes misfired or "running on 3 cylinders" according to a foreman. I found the culprit, I think... it's the coil boot. One of it got ripped. Probably those SC technicians didn't unplug it properly (I never service my car outside of SC, until now). My foreman said it can still be use, he just wrapped it with a black tape, but still my car has difficulty to start sometimes. Although I didn't noticed any misfiring while driving anymore, sometimes it felt like there's a power lag from when you request it from the throttle. I understand you can just replace the coil boot, but since my car is already 9 years old, I decided to change all four.
I have also asked some shops and people, they do not recommend using K20 coil without changing ECU whether stand alone or piggyback. Stock ECU does not make use of the third terminal on K20 socket. So there will be no improvements.
Surveyed those aftermarket ignition coil like Napol for example, I just don't have confidence on their reliability some said it works, some said it didn't last.

I saw some people use part number PW812018, some use part number PW812712. I decided to check NGK website (since they supply Preve spark plug) and they recommend PW911283 but all online sellers said this is for Proton Iriz, new Persona and Saga

What is going on here?

I have similar issue. Go to SC and they recommend replacing the boot latch. Haven't changed yet


I got this issue occasionally too. At first I thought the door switch is the culprit. Did self test and indeed the front passenger door switch was faulty. Replaced it. Works fine for a few weeks until it started again.
Bought OBD reader and scan using Car Scanner app. Got result about immobilizer not detected or something. Check with SC they too suspect the key fob is faulty.
They ask me to use my spare key fob instead to properly confirm their suspicion.

Have you found out what's causing your issue? It's been 6 months since your last post




I bought the steering garnish from Shopee and asked SC to install it for me. Issue resolved. The steering garnish comes with buttons and small circuit. I think it's time you replaced yours. The new Exora steering garnish looks nicer IMO, and probably could fit our steering since the steering itself is still the same design.
I regret not checking it out first before buying my steering garnish

This post has been edited by fix24311: Apr 30 2023, 02:22 AM

Fixed the problem myself after consulting Dr. Youtube.

Not 100% identical lock but same principle.

There is one moving part that will engage the lock when the lid is pressed down. This part needs some greasing for it to move freely.

Replacing it with a new one is not just a waste of money but also a waste of resources (metal, plastic, etc) while a simple fix can do the job.

hello guys,

3500rpm @140km/h is normal for Preve Turbo?

long time not driving my preve.

your RPM will stay the same even as the car gets older... it won't rev higher to maintain same speed.

Suprima is 3000rpm for 140kmh

i think my preve gearbox already have funny behaviors'. In the morning, cold start. start the drive, feel like over rave. it is very hard to drive in traffic jam. the rpm also not really normal. already done service and clutch adaptation. still feel the same. now speeding in highway 140km/h at 3300 ~ 3500rpm.

check your OCV that could be the problem of erratic engine RPM

Hi, I'm having the same issue currently. Just to be sure, "when the lid is pressed down" do u mean the key fob button?

So have to open up the key fob and service it basically? tq

I guess this

Yes, that is the one. There is a latch on the other side. spray oil on the inside and use a small rod / screw driver to move it side way, so that it is easier for it to move.

Good luck!