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Mazda 2 Engine trouble.

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I have a 8 year old Mazda 2 and the engine light came on the dashboard and I lost some acceleration. I took it to the Mazda centre in Bangkok and they said it would be 58,000 baht to repair. New Solenoid or something, crankshaft motor, valve gasket ring oil change etc. This seems ridiculous for a car that is make worth 200k. Can anyone advise what to do?

The mechanic said maybe if I change the oil and gasket, the computer will stop saying that the crankshaft motor or something will need to be replaced.  Confused. No visible leak on engine top.
Is there a cheaper option?

You can find an independent repair shop who will plug into the car's Canbus and the car will tell them what caused the engine light to come on. Then work from there. 

The engine light on my truck has been on for 5 years but it still runs OK. A mate has a magic machine and it said the O2 sensor is faulty. 

11 hours ago, RobKray said:

I have a 8 year old Mazda 2 and the engine light came on the dashboard and I lost some acceleration.

Loss of acceleration sounds like misfiring from worn spark plugs, one or more of the plug coils or a MAF sensor failure. All of which are easily repaired, you can do it yourself.

When does the vehicle start losing power? After it’s warm, or when cold? 

11 hours ago, RobKray said:

I took it to the Mazda centre in Bangkok and they said it would be 58,000 baht to repair. New Solenoid or something, crankshaft motor, valve gasket ring oil change etc.

Seems ridiculous.

11 hours ago, RobKray said:

The mechanic said maybe if I change the oil and gasket, the computer will stop saying that the crankshaft motor or something will need to be replaced.

What needs to be done first is to replace the spark plugs then clear the codes by disconnecting the negative battery terminal for a few minutes. If that doesn’t work then buy one spark plug coil and test it on each cylinder and go for a drive for each cylinder test to see if it accelerates normally. If that doesn’t work then clean or replace the MAF sensor failure. My guess is that it’s worn spark plugs.

Another thing to keep in mind is, running a with faulty plugs or MAF can ruin the catalyst by pumping raw fuel in the exhaust and can cause the converter to burn too hot. Consider in getting an obd2 reader and keep it in the vehicle, comes in handy especially for a simple diy 20 minute repair, it’s good to have even for those who are not mechanically inclined.

11 hours ago, RobKray said:

I have a 8 year old Mazda 2 and the engine light came on the dashboard and I lost some acceleration. I took it to the Mazda centre in Bangkok and they said it would be 58,000 baht to repair. New Solenoid or something, crankshaft motor, valve gasket ring oil change etc. This seems ridiculous for a car that is make worth 200k. Can anyone advise what to do?

The mechanic said maybe if I change the oil and gasket, the computer will stop saying that the crankshaft motor or something will need to be replaced.  Confused. No visible leak on engine top.
Is there a cheaper option?

 

Diesel or Benzine?

  • Author
1 hour ago, Ralf001 said:

 

Diesel or Benzine?

Benzine

  • Author
1 hour ago, novacova said:

Loss of acceleration sounds like misfiring from worn spark plugs, one or more of the plug coils or a MAF sensor failure. All of which are easily repaired, you can do it yourself.

When does the vehicle start losing power? After it’s warm, or when cold? 

Seems ridiculous.

What needs to be done first is to replace the spark plugs then clear the codes by disconnecting the negative battery terminal for a few minutes. If that doesn’t work then buy one spark plug coil and test it on each cylinder and go for a drive for each cylinder test to see if it accelerates normally. If that doesn’t work then clean or replace the MAF sensor failure. My guess is that it’s worn spark plugs.

Another thing to keep in mind is, running a with faulty plugs or MAF can ruin the catalyst by pumping raw fuel in the exhaust and can cause the converter to burn too hot. Consider in getting an obd2 reader and keep it in the vehicle, comes in handy especially for a simple diy 20 minute repair, it’s good to have even for those who are not mechanically inclined.

Thanks. It seemed to be when starting the car the acceleration was lower but seems to get better as I go on.

Ive changed the oil and added additive.

well not myself, that’s beyond be.

So you think they are trying to gouge me, the Mazda center? Talking about solenoid VVTs etc.

One mechanic, a younger one, told me on the side, just change gasket and oil and the problem might go away.

I took it to another opinion and he wasn’t sure. No one mentioned spark plugs, but sounds similar to a problem I had years ago. No oil seen on ground. Not really any on top of engine but thought I smelt something a bit different yesterday, like a oil smell.

Thanks again for your advice.

 

13 hours ago, RobKray said:

The mechanic said maybe if I change the oil and gasket, the computer will stop saying

Don't go back to this mechanic 

Our M2 was a POS after about 8 yrs / 150k kms ... BUT ... the Mazda mechanic sounds like an idiot and hasn't a clue what it might be.  Oil change :cheesy:

 

Go with the advice and start with changing the plugs, and disconnect battery to reset.

23 minutes ago, RobKray said:

So you think they are trying to gouge me, the Mazda center? Talking about solenoid VVTs etc.

A vvt shouldn’t be much more than 3000฿ for the part. Replacing a vvt is quite an easy task of removing the valve cover which will need a new gasket which costs next to nothing. It shouldn’t take much more than an hour, personally can do a four cylinder of replacing the vvt, spark plugs and inspect the coils in less than an hour. It shouldn’t cost more than 8000฿ labor. Try looking for a mechanic that specializes with Mazda/Ford (these mechanics usually work on both) in your area, not a dealership/stealership where Mazda is going to be more expensive than other makes. Or just look for a competent mechanic, these things are easy to work on.

  • Author

Here is the exact thing the Mazda dealer said -  

Need a new Motor VVT - 24,900 baht

ACTR variable - 16,400 baht

And here is a conversation I had with another mechanic who saw the report from Mazda. He must be using some translator as he doesn't speak english.! 
He seems to know more?
 

image.png.fb0f159a959406fdfb7b063af2e242da.png

image.png.be187057fc78d3e9f6243bdec27c9609.png

Go to an independent mechanic and they will read the fault code for 500 baht. This will give you the code that tells you the cause of the engine light coming on.

 

Changing the spark plugs is also advisable. 

I am in the same situation. Orange warning stopped after changing oil at Mazda. New check with be on 24/10. Let's see if they come back with this problem.

Also, I ask Mazda staff that I know some good Mazda repair shop (for another Mazda, change the breaks).
OP can PM me but I never contact him before, so cannot (yet) recommend him.
The one you contacted seems to know his job and yes, moving the engine out and putting it back is not an easy job, I was told.

  • Author

Thanks everyone, found another mechanic who had a computer and tested it.

It was in Portuguese!
They said to take it tomorrow and they’ll take out vvt thing and something else and clean them as could just be sludge, maybe change the gasket and hopeful that will fix it, no more than 1500 baht.

 

IMG_0032.jpeg

5 hours ago, RobKray said:

They said to take it tomorrow and they’ll take out vvt thing and something else and clean them as could just be sludge, maybe change the gasket and hopeful that will fix it, no more than 1500 baht.

How many kilometers has it driven? Have you had regular oil changes?

  • Author
13 hours ago, stubuzz said:

How many kilometers has it driven? Have you had regular oil changes?

80,000. Yes, regular oil changes.

  • Author
  • Popular Post

Good news, they changed the valve seal, cleaned/washed a sensor that was clogged, now engine light it off,computer shows no problem, got my power, acceleration back.

Thanks for all replies, it sure helps to shop around, 2,000 baht total.

clean sensor vvt - 600

valve seal - 835

labour- 500

6 minutes ago, RobKray said:

Good news,

Great to hear, you got lucky this time 👍

 

See you at the AN Christmas party, buy us a beer, cheers 🍺

On 10/9/2025 at 11:05 PM, VocalNeal said:

You can find an independent repair shop who will plug into the car's Canbus and the car will tell them what caused the engine light to come on. Then work from there. 

The engine light on my truck has been on for 5 years but it still runs OK. A mate has a magic machine and it said the O2 sensor is faulty. 

I have the exact same it was Nissan that I took it to,  mine still runs fine, after a few years, a google search said it affects fuel consumption, well mine is just the same. But the OP has lost "some acceleration" I have not. I would get an oil and filter change and use synthetic oil, (not at Mazda)

On 10/11/2025 at 2:52 PM, RobKray said:

Good news, they changed the valve seal, cleaned/washed a sensor that was clogged, now engine light it off,computer shows no problem, got my power, acceleration back.

Thanks for all replies, it sure helps to shop around, 2,000 baht total.

clean sensor vvt - 600

valve seal - 835

labour- 500

You are lucky to be able to fix it there for a nice price. I try to find in Chiangmai a not so greedy mechanic, no luck for now.

I recommend replacing the shaft sensor (if you don't mind the cost), even though it seems fine now. 
My FORD oil change is every 15000. I never follow manufacturer and I did 1st oil change at 6000 and next will be at 8000. Keep engine and all other parts clean, if you want to keep your car for long and saves you $$ in future. 

What is wondering me, I dont see they hooked it up with computer diagnostic.

In it, codes pop up with what could be or is wrong.

If there are sensors broken , like oxygen or carbon dioxide sensors. 

You have to find someone with such a reader and hook it up.

Weird a central MAzda dealer cant? It is essential for a garage nowadays.

Once red , a broken oxygen sensor, will give the computer a"fixed "amount to run then, 

but then car isnt optimal working.

 

Ever seen the list of codes on an engine? 

See this one https://obdadvisor.com/codes/vw-fault-codes/

That is for a VW .

You see the P code  faults, there are already 102 pages!

Without that diagnostic, you cant tell. THey cant tell.

 

 

  • Author
On 10/16/2025 at 8:55 PM, xtrnuno41 said:

What is wondering me, I dont see they hooked it up with computer diagnostic.

In it, codes pop up with what could be or is wrong.

If there are sensors broken , like oxygen or carbon dioxide sensors. 

You have to find someone with such a reader and hook it up.

Weird a central MAzda dealer cant? It is essential for a garage nowadays.

Once red , a broken oxygen sensor, will give the computer a"fixed "amount to run then, 

but then car isnt optimal working.

 

Ever seen the list of codes on an engine? 

See this one https://obdadvisor.com/codes/vw-fault-codes/

That is for a VW .

You see the P code  faults, there are already 102 pages!

Without that diagnostic, you cant tell. THey cant tell.

 

 

The mechanic said the sensor was clogged up and dirty.

Working OK but I’d say 90% of original acceleration.

  • Author
On 10/16/2025 at 1:44 PM, OneManShow said:

I recommend replacing the shaft sensor (if you don't mind the cost), even though it seems fine now. 
My FORD oil change is every 15000. I never follow manufacturer and I did 1st oil change at 6000 and next will be at 8000. Keep engine and all other parts clean, if you want to keep your car for long and saves you $$ in future. 

He said he’d be able to get me a second hand one if I want from Chiang Kong, near my house in Samut Prakan.

9 hours ago, RobKray said:

second hand

Your own car sensor is like a second hand. 
Replace it with a new one. 

  • Author
On 10/20/2025 at 9:29 AM, OneManShow said:

Your own car sensor is like a second hand. 
Replace it with a new one. 

Sometimes good as new can be found in second hand cars.

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