Hi all,

nice to be member of this comunity!
For the start - I have a question.

My stilo 1,6 76kW (2004) is indicating MIL - trouble codes are P0300 and 0302 (sometimes 0303).

So, I replaced spark plugs and coils (all of them NGK, type as same as in the manual).

Condtions when it appears - highway speed (more than 4000 RPM for a longer time).
After some time (maybe 2-4 minutes) starts flashing MIL (sometimes for a few seconds, sometimes for a minute max). When it flashing engine has no power problems or vibrations.

So, Im thinking about replacing fuel pump or knock sensor. Is it good way or not?

PGlock:

It is really interesting problem.

First when I read you post it is camed to my mind to change the coils but as I see you did it already.

I searched for this code in Google and it can be caused by many problems.

Please look arround in this link maybe it helps a bit.

https://www.obd-codes.com/p0300

Welcome at FiatForum,

O2 sensor.
Fiat used to advice to replace this sensor every 100.000-120.000km's...
It's a NTK brand sensor.

Hi guys,


yep, I have replaced ignition modules and spark plugs.

Im thinking about ****ed lambda sensor - pre cat lambda. Now, It´s really cheap, so i have no problem with replacing it.

Stilo is nearly 90kkm (real), so maybe thats the problem.

Which brand would you recognize? Bosch, Magneti Marelli?

OE ( original equipment) O2 sensor is NTK ( NGK brand).

Do you have mister-auto in your country?
They sell inexpensive carparts online, and have different websites for different countries.

www.mister-auto.co.uk

https://www.ngkntk.co.uk/

No, we haven´t.

We have autokelly and TecDoc.


Both of them (Bosch, NGK) are about 1000Kč, so it´s ok.

I will replace it.

Let us know the result, if you will!

Hi guys,

finally I have replaced the pre-cat lambda.

Now - better idle with less vibrations, better starts, engine runs smoother than before. I hope o2 sensor was the problem.

Removal and replacement was without problem. Original o2 sensor was Bosch, I have replaced It with NGK brand O2 sensor.
Price was so good - 1,200Czk with shipping.


Thanks for your help!