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RvB

Is it likely to be an 02 sensor?

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Looks like I'm still chasing this.¬†ūüėí

Engine light has come on again after about 100 miles, only this time I've got a different code (progress I guess!).

1 Fault Found:
16556 -  Fuel Trim; Bank 1: System Too Rich
        P0172 - 35-00 -   -
---------------------------------------------------------------------------

I haven't looked at fuel trims yet, as engine is cold so will take it for a drive later to see what it's doing. But is there something I'm missing on the vacuum/air side to check for leaks? A system that kicks in later when hot and driving, egr or breather system or something like that? as the trims looked pretty normal initially.

 

Edited by RvB

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Well that's a long list of possibles to keep you busy: http://wiki.ross-tech.com/wiki/index.php/16556/P0172/000370 

if the vacuum hoses look old and are long enough cut the ends off and reseat them. Brake servo hose is a common fail as it gets brittle. Hot problem could be EGR, manifold leak, fuel side, compression, all sorts of stuff, just work your way thru the cheap and free stuff methodically.

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On 1/22/2019 at 10:59 AM, RvB said:

My lad's 2003 Arosa 1.4 Sport brought the engine management light on a couple of days ago. Car was running fine before it came on and after too. I've put vag com on it and got this:

1 Fault Found:
16804 -  Catalyst System; Bank 1: Efficiency Below Threshold
        P0420 - 35-00 -  

 

I've cleared the code and driven it about 10 miles and the eml hasn't come back on yet. I've checked for exhaust leaks and can't see/hear anything, so I'm wondering if the knowledgeable folk of clublupo have come across this one before. Do the o2 sensors fail with age on these cars or is it more likely the cat itself?

We got the car in November and it hasn't done a lot of miles since as he's still learning to drive, in fact it hasn't done a lot of miles in the last few years as the previous owner only did about 1200 miles a year and so did the previous owner to that. So I'm hoping it's just gunged up and a few good spirited drives will clear it out a bit, but if not any ideas where to look?

Give it a full dose of cat cleaner and give it half-to an hour on a motorway

Edited by weslangdon
you have had the same advice already, sorry

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My hunch is an air/vacuum leak.

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