HELP with Mrs Golf needed, please

[M-A8]

Hi everyone.

As per title, I'd like to ask for your help/guidance as unfortunately I am not a very good mechanic. I understand what the errors are about (more less), but thats about it. I'm able to replace lambda sensor, solve the misfire and locate EGR, but understanding of how they relate to each other in case one of them fails is pretty equal to 0

VW Golf IV 1.4 petrol

Address 01: Engine Labels: 036-906-032-AXP.lbl
Part No: 036 906 032 L
Component: ME7.5.10 3869
Coding: 00031
Shop #: WSC 00117
VCID: 193922F183164CD67C9-5140
WVWZZZ1JZ2P272855 VWZ7Z0A4403030

4 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - Intermittent
16685 - Cylinder 1
P0301 - 35-10 - Misfire Detected - Intermittent
17604 - Oxygen (Lambda) Sensor Heater Circuit: B1 S1
P1196 - 35-10 - Electrical Malfunction - Intermittent
16785 - EGR System
P0401 - 35-00 - Insufficient Flow
Readiness: 0000 0000


My first and only one for now question is: Could a misfire on a cylinder 1 possibly cause other two errors to come on, lambda and EGR, or could wrong reading on lambda sensor make EGR to not work properly and cause misfire, and finally, or could EGR cause a misfire on a cylinder 1 and lambda sensor to fail/read incorrect values????

Any input before I start digging will be VERY much appreciated

I haven't driven the car yet, but engine is just doesn't sound right. I've asked Mrs if car has less power or if she noticed any difference since the light came on the dashboard, and she said not really !!!! Really??? Don't take me wrong, but if I would remove the windscreen completely and ask if she can feel/notice any difference, the answer would be probably: Not really

And on that note I'd like to Thank You ALL for your time and any input.
Cheers

[M-A8]

Come on guys...I know it hasn't got 4 rings BUT I know you know the answer to it, or at least have some advice.
I don't trust many people, especially when 3 vw forums says one thing and one something different and thats when I'm lost as this sort of mechanical repairs are not my thing, but I trust your expertise guys very much
So don't be shine, know one will dislike you for helping to a VW owner

[ainarssems]

Lambda sensor fault is not critical, it's just for the heater so it will take longer for lambda to start working on cold starts say 2 minutes instead of 20 secs.

The first to look at is cylinder 1 misfire and it can be causing multiple cylinder misfires. Check spark plug, ignition coil, injector and wiring for cylinder 1.

[M-A8]

....aaaaaaand we finally broke the ice

Cheers ainarssems, I appreciate it

I will play with it tomorrow.
Changing lambda sensor shouldn't be a problem anyway.

Year ago I did a full service on it inc. spark plugs inc all the wires for it and stuff such as new discs and pads, clutch, engine and gearbox oil/filter, water pump, alternator belt, cambelt, thermostat, all fluids all round and on and on and on.
Everything was fine till this week.

How about EGR, could this fault be related to misfire???

What shall I look for when checking injectors and other bits?? I know this may sound silly but I'm just not good in the engine area, sorry.

Thanks once again

[ainarssems]

Start with checking all the plugs, make sure they are correctly and fully plugged, check for water ingress/corrosion. Check wires for visual damage. Then move to swapping parts between cylinders-spark plugs, coils, injector one at the time and see if cylinder 1 misfire moves to another cylinder together with the part.

[Delboy]

Has the car been serviced regularly? Had a fuel filter recently? Not gad bad furl put in it etc?