VW Polo NCT fail - your thoughts please!

Chevy RV

Hello There Everybody,



Could you please see attached NCT Cert fail!

VW Polo NCT.JPG


Any ideas on what might be the cause would be most welcome ?


Regards,


Chevy RV

chicorytip

Chevy RV wrote:

Any ideas on what might be the cause would be most welcome ?

What age is the vehicle and has the engine been serviced recently?

Toyotafanboi

Assuming it's the 1.2 3 cylinder.

They are a dose to get through the emissions test.

All your readings are miles out.

Could be a multitude of things. The car must be running badly?

Unfortunately those engines are prone to stretching timing chains, throttle bodies failing, coil packs failing, cyliner head valves burning and various other ailments, any of which or any combination of which could be causing this.

Get it properly diagnosed. Let nobody sell you full service, a bottle of dipetane or a lambda sensor. They will be a waste of money.

jca

Bye bye car...another one for the breakers.

rex-x

Lambda reading is far too rich which is causing the other readings to be so high, I wouldn't be sending it to the knackers yard just yet You may have an exhaust leak pre lambda or potentially the sensor itself is gone. Get it properly diagnosed

jca

rex-x wrote: »

Lambda reading is far too rich which is causing the other readings to be so high, I wouldn't be sending it to the knackers yard just yet You may have an exhaust leak pre lambda or potentially the sensor itself is gone. Get it properly diagnosed

It may well be a simple fix but be warned op, these engine's are a nightmare. Set yourself a budget and don't be talked into exceeding it. Has the car been recently serviced?

rex-x

jca wrote: »

It may well be a simple fix but be warned op, these engine's are a nightmare. Set yourself a budget and don't be talked into exceeding it. Has the car been recently serviced?

I agree these engines are a nightmare but you must understand what you are looking at with readings. Lots of weekend mechanics give poor advice on emissions. When the car was serviced will have no bearing on this problem based in the results.

jca

rex-x wrote: »

I agree these engines are a nightmare but you must understand what you are looking at with readings. Lots of weekend mechanics give poor advice on emissions. When the car was serviced will have no bearing on this problem based in the results.

Typical condescending boards answer. I understand exactly what the readings mean. Op be careful, if a full service including a new air filter + a check for a cracked exhaust manifold + a new O2 sensor( see the money adding up already?) Doesn't dramatically improve the readings STOP and don't spend another shilling of your hard earned cash on this car.

rex-x

jca wrote: »

Typical condescending boards answer. I understand exactly what the readings mean. Op be careful, if a full service including a new air filter + a check for a cracked exhaust manifold + a new O2 sensor( see the money adding up already?) Doesn't dramatically improve the readings STOP and don't spend another shilling if your hard earned cash on this car.

That wasn't a dig at you it was actually good advice.... The OP doesn't need a new air filter or a new O2 sensor, what they need is competent diagnostics which will reveal the source of the issue. 5 mins with a good scanner and a good mechanic will rule out an O2 sensor etc

mullingar

Wow, they are waaaay off.

With both a high CO & HC, it's running extremely rich. There is not enough O2 to burn the excess fuel and also results in incomplete burn so CO is made instead of CO2.

This could be as simple as an air filter or something more serious. Get it diagnosed properly.

Sabrielle

I just put a 05 wv polo through the NCT on Saturday and it passed. I can't believe it as all the threads on here say they are very hard to get through on emissions.

biko

Congrats

mullingar

Sabrielle wrote: »

I just put a 05 wv polo through the NCT on Saturday and it passed. I can't believe it as all the threads on here say they are very hard to get through on emissions.

You are just lucky. Keep it serviced very frequently and it might last a bit longer.

These engines have a well known reputation for going wrong, and when they do its usually expensive.

nct tester

mullingar wrote: »

You are just lucky. Keep it serviced very frequently and it might last a bit longer.

These engines have a well known reputation for going wrong, and when they do its usually expensive.

The 1.4’s aren’t as bad the 1.2 3 cylinder ones. I’d advise anyone to stay away from a 3 cylinder petrol VW, Seat or Skoda from an emissions point of view.