Emissions nightmare continues!

[Jollus]

Hi everyone.

A few months ago I posted about my emissions nightmare around the MOT. Well since the light was coming on so often I took it to a really good diagnostics place I know for and they replaced my cat converter as it was hollow. The emissions light came on again with a week and the ECU kicked into limp mode as it was a coil again. I replaced two coils so that each coil is now an NGK factory fitted one. Now the light has re-appeared after a month (with no difference in the performance). The fault code that is coming up at the moment is:

17550/P1142/004418 - Load Calculation Cross Check: Lower Limit Exceeded

I typed it in on Rosstech-Wiki which retrieved:

Possible Causes
Mass Air Flow Sensors (G70) faulty
Intake Air System faulty/leaking (false Air)
Throttle Pedal faulty
Throttle Body dirty/faulty

Possible Solutions
Check Mass Air Flow Sensors (G70)
Check Intake Air System
Check Throttle Pedal
Check Throttle Pedal Position Sensor (G79)
Check Throttle Pedal Position Sensor 2 (G185)
Check Throttle Body
Check Angle Sensor 1 for Throttle Actuator (G187)
Check Angle Sensor 2 for Throttle Actuator (G188)
Check Engine Control Unit

Would it be worth me garaging the car for them to check the relevant areas or does anyone have any hunches as to what it could be? Also I am not sure whether the emissions are rectified since the replacement of the Cat converter. But it clearly needed a change as it was hollow.

The vehicle in question is a 1.4 petrol Polo 9n 52 plate with BBy engine code.

Many thanks.

[RUM4MO]

Hi, I don't quite get this "cat is hollow" bit, my wife has a 2003MY BBY and it definately has a metallic monolyth in the first cat and I'd expect the same in the second cat as ceramic monolyths were meant to be things of the past. There again maybe some weird event has melted the metallic core! One other thing, I'm not trying to be a "nit picker", NGK as far as I know, never made OEM COP coils for these cars - they should be Eldor (made in Italy) or if you were very unlucky, Bremi (made in places where they are learning to make coils). Are you sure that the complete EGR system has been checked over and all the pipework and valve cleaned? By the way, is this car "using" much engine oil and is it used for normal - 10+miles daily journeys?

Interpretation of fault codes - maybe you should join the VAG-COM or VCDS forum on your venders website - they normally know all or most of the answers - and RossTech experts tend to look out for postings.