Ok this one will be long.
My 2009 Persona started giving me problems a week ago. It went into safe mode (CEL came on and cannot drive more than 30km/h) I switched off and started it back up, it became ok again. After googling most people say that it's the O2 sensor so I ordered online and waited. Throughout the week that happened again a few times but went away after I restarted. Today I have the O2 sensor already and wanted to change during my service but the car went totally dead on the road. Refused to be restarted. Towed to the SC and they plugged their pdt, but no response from the ECU. After a while they eventually told me I have a dead ECU, a new one is RM1k. Saw a few second hand ones online for about RM500 to 700. I don't know if I should repair it or not. I don't recall the ECU got wet or anything under there. I am puzzled as to why it got damaged.

U mean the ori one? 

what is the tyre size of persona?

Ok this one will be long.
My 2009 Persona started giving me problems a week ago. It went into safe mode (CEL came on and cannot drive more than 30km/h) I switched off and started it back up, it became ok again. After googling most people say that it's the O2 sensor so I ordered online and waited. Throughout the week that happened again a few times but went away after I restarted. Today I have the O2 sensor already and wanted to change during my service but the car went totally dead on the road. Refused to be restarted. Towed to the SC and they plugged their pdt, but no response from the ECU. After a while they eventually told me I have a dead ECU, a new one is RM1k. Saw a few second hand ones online for about RM500 to 700. I don't know if I should repair it or not. I don't recall the ECU got wet or anything under there. I am puzzled as to why it got damaged.

195/60/R15
Sorry to heard that.

How about used ECU from half cut shop?

Something to note before you decide to fix outside of SC. If after order new ECU for you and changes the ECU doesn't revive your car, Proton SC cannot hardsell you the ECU they ordered for you. So expensive car like that I think it's worth dealing with SC.

Above of your ECU is where your air conditioner colling coil is located, might be there leaking?

I have a OBD reader with Torque app for CEL code check. Might be good for you to keep one for future use. Just in case you decided to replace ECU.

By the way persona O2 sensor is the one with green cable sheath.. Spare part shop gave me black colour sheath Gen2.. Ended up money wasted.

Yea. I decided to get a used ECU. RM450. But the car is stuck at the SC so I will just pay them labour charges to replace the ECU. Now waiting for the ECU to arrive

How about the reason your previous ECU went bad? Any idea? Might be useful for us to know so can avoid same predicament as yours.

Any one change the brake pump before?

Mine had change different type of brake pad, service brake pump, seems the braking power still the same....SUCKS

iinm want upgrade braking power, need to consider change to double layer brake servo, better brake disk, better brake pad, use steel hose, better brake fluid.

use same stock single brake servo will feel no difference.

btw, what brake pad you use?

in order :
1) change better brake pads

2) change better brake disk /rotor
(better change brake pads and rotor 1 shot like  TRW brake pads with TRW brake rotor)
some say change brake pad and rotor still same & no difference, so process with :

3) change to steel braided brake hose

4) change to better brake fluid
if enough, can stop here. if still nt enough

5) change to double layer brake servo

reference :

TitanRev on proton saga brake -->  https://forum.lowyat.net/index.php?showtopi...post&p=88212352

persona -- > https://eilarazi.blogspot.com/2012/10/cara-...mbrek-pada.html

Normal brake pads only.

Good advice given, I think I will try point 2 first.
thanks bro. for your sharing. 

Is someone can share something for me?
If we pour water onto the windscreen, did you check which way all the water go?
My believe is the water should go into the hole that drain all the water behind the fender. My test this evening, some of the water overflowing between the plates of fender and body, making it enter the engine compartment excessively, just on top of the absorber mounting, both side. Checked my friend's persona also like that.
Now we are wondering if that normal which I don't think so. I am afraid under the heavy rain, the water will flow into some wiring parts and moving parts such as pulleys and belt.

Same. The firewall insulation will get wet.

Is someone can share something for me?
If we pour water onto the windscreen, did you check which way all the water go?
My believe is the water should go into the hole that drain all the water behind the fender. My test this evening, some of the water overflowing between the plates of fender and body, making it enter the engine compartment excessively, just on top of the absorber mounting, both side. Checked my friend's persona also like that.
Now we are wondering if that normal which I don't think so. I am afraid under the heavy rain, the water will flow into some wiring parts and moving parts such as pulleys and belt.

one of the workshop recommend if interested.

btw, if change brake pad & rotor, change brake fluid also 1 shot.

https://forum.lowyat.net/topic/4028598

Noted on your advice. 

The workshop in Melaka? I'm in KL, bro.

Just drove to and fro Melaka and Perlis, about 630km a way and speed was at mostly on 110kmj to 120, 130 to 140 for a short period when overtaking the vehicles only. Petrol is roughly about RM80 a way in real consumption from point to destination point. FC showed 7.1ltr/100km.

Not bad bro with the speeding.... On lethargic day if i drive on highway with 100 constant i can get below 7L/100km.

Means that IAFM only impacts city driving.