1.8 petrol - check engine light

[EVS]

Afternoon everyone, another post since you all helped me so well last time...

Background: After fixing the fuel filter issue, my car seemed ok. On the first run on the motorway, it felt like the car was slightly "short of breath", with sort of "hiccups". Next time I started the car, this was no longer an issue so I figured it could've been due to the fact I had siphoned one side of the tank. New trips on the motorway also failed to reproduce the "hiccups", strengthening my idea it was due to uneven fuel distribution and that this was now sorted.

After about 100 km, the check engine light switched on. There are no further issues, the engine runs smoothly, but all of a sudden there it was lighting up my dashboard.

Since this forum helped me last time where the mechanics failed, I return here: do you have any thoughts of what might be the cause, things I could check myself?

[T-Cut]

The first time I fitted the clip (the original orange version), I still had signs of fuel starvation and eventually discovered that the old o-ring on the filter module wasn't sealing properly. Did you renew the seal or just fit the clip?

A very common cause of the 'check engine' warning is an issue with the catalytic converter. My 2004 turbo had that too.

TC

[EVS]

I replaced the old o-ring as well, so that part should be alright for at least a while now, I hope.

Sounds like back to the shop it is, then, since I don't have the tools to check the catalytic converter...

[suzublu]

Probably a lambda sensor. Check the wiring to them or fit new ones

[T-Cut]

On the 1.8Turbo at least, the upper lambda sensor wiring is located quite close to the exhaust manifold, where it's vulnerable to heat damage.


TC

[EVS]

Thanks for the explanation, again
New question, since this is the first car I'm actually working on myself: do I need a specific kind of lambda sensor? There seem to be several options and I honestly have no idea which one would do the trick

[ADO282]

Forgive me if I'm speaking out of turn here, would it not be a good idea to read the fault codes from the ecu and take it from there?


It might be something not related to the lambda sensors, and there are two of them to choose from.


This may save you from unnecessary work

[EVS]

Sound advice, but I figured it couldn't hurt to ask.
The filter issue cost me an arm and a leg already since the mechanics couldn't find it, so if I can save another small fortune by asking on here, I figured it's worth a shot

[drewbie]

I agree with ADO, the money you stand to waste just guessing would buy you a cheap reader.

[EVS]

Okay, so while I am waiting for the reader to be delivered, I had to use my car today. The check engine light did not show up, and the message in the display did not show either. When simply turning on the contact, the check engine light does light up, so it did not simply die.
I haven't done anything to my car yet, the message just disappeared on its own?
Has anyone else experienced this?

Then, as I was driving, all of a sudden, the car lost power and eventually stalled, showing "low oil pressure".
It lost power again as I was heading home, but this time it did not stall and the "low oil pressure" notification did not show up
The oil level is correct, what should I look into in order to sort that?