Hi All,

First post for me. Bought an '03 Fabia, 1.4 MPI AQW engine in it, and this connector was disconnected...

Reconnecting it changed nothing so im curious as to what it is... Right above the abs pump and next to the coolant reservoir. Any help would be amazing. Thanks in advance!

Welcome

 

I have the same engine. It's quite hard to see what it is from your pic. A better pic would perhaps help.

Edited 24 December, 20214 yr by TMB

@TMB is this any better?? The upper wires go into the car through the top, wasn't able to trace the bottom.

Much clearer picture but I am unable to tell where it's going, unfortunately. Mine is different with it being right hand drive.

It's not the one to the pre cat 02 sensor is it that lurks down that area but would have thought you would tell if it was disconnected.

Disconnect it ASAP, its the self destruct countdown timer 😆

 

That might be wrong, the countdown might start from when you disconnect it 😆

I think @Stewartasb may be correct. 

10 hours ago, Wino said:

I think @Stewartasb may be correct. 

 

I did wonder if it was the pre-cat lambda sensor plug but I would assume the MIL would be lit with the plug disconnected. Unless someone's bunged the light up with Blu Tak or something.

Edited 26 December, 20214 yr by TMB

I would have thought the car eould be running poor as well as you say mil light must have been tampered with if it is the 02 sensor.

What dort of figures you getting on the mpg ???

It does look to be the oxygen sensor from the photo that TMB has posted.

 

I would say that it had failed and the mixture was going high or low and it was disconnected so it could run on the default limited operating strategy map which will block the cat in a relatively short time if not replaced.

 

It should trigger the MIL lamp so that is a mystery.

OP should check whether that little orange engine lights up in the instrument cluster at ignition on.

So just a quick update, being that it's my uncles car. Ran no better with the plug connected, but runs good in general. Although he gets around 9 liters to the 100, the dash reads anywhere between 17 and 25, which is weird. The check engine light was on upon buying and was reading a faulty lambda sensor. Upon resetting it today, the car ran the same but the light popped up again only a few hours later. Could the plug itself be a lambda plug potentially? It is an 03 1.4 with an AQW engine...

Lambda sensor = O2 sensor, you have found the reason for the fault code.

 

Had you reconnected the plug & left it connected before erasing the fault code & was it still connected when the MIL light came on?

 

If so then my hypothesis about a failed Lambda sensor & them disconnecting it was correct & you should replace it.

40 minutes ago, EmirGan said:

So just a quick update, being that it's my uncles car. Ran no better with the plug connected, but runs good in general. Although he gets around 9 liters to the 100, the dash reads anywhere between 17 and 25, which is weird. The check engine light was on upon buying and was reading a faulty lambda sensor. Upon resetting it today, the car ran the same but the light popped up again only a few hours later. Could the plug itself be a lambda plug potentially? It is an 03 1.4 with an AQW engine...

Do you mean 17 to 25 mpg if so as we've said its due to the disconnected 02 sensor and now it's reconnected that's proof it's probs defective as I've just been through this get it changed quick or your catalytic converter will be toasted before you know it.

23 hours ago, EmirGan said:

Could the plug itself be a lambda plug potentially? It is an 03 1.4 with an AQW engine...

 

Umm, go back and read the posts properly, and see the pic I posted.