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[Proz]

Fault back again ...... in the diagram above i dont seem to have a pre cat where the pipes join ..... looks to me like the pipes just join together there  

[Proz]

Called Vx and cause it was only in a fortnight ago for the same problem when they replaced the cat they are going to check it for free ... when i quizzed about what it could be he said could be the ecu as well as other things ..... just have to wait and see  

[Auto Addict]

Called Vx and cause it was only in a fortnight ago for the same problem when they replaced the cat they are going to check it for free ... when i quizzed about what it could be he said could be the ecu as well as other things ..... just have to wait and see  

Any other symptoms?

Does it always start first turn of the key?

When the engine is hot and ticking over, does it seem to almost stall when you put it in drive?

Have you taken the Eco strip off and had a look at the plug wells?

[Proz]

Called Vx and cause it was only in a fortnight ago for the same problem when they replaced the cat they are going to check it for free ... when i quizzed about what it could be he said could be the ecu as well as other things ..... just have to wait and see  

Any other symptoms?

Does it always start first turn of the key?

When the engine is hot and ticking over, does it seem to almost stall when you put it in drive?

Have you taken the Eco strip off and had a look at the plug wells?

Car starts fine first time every time hot or cold and even with the warning light on it feels fine ie no loss of power etc..... there are no symptoms at all ..... just driving along nice and gentle and on pops this light with the same code every now and then ...thought the new cat fixed it as that was 2-3 weeks ago but obviously not  ... no stalling when put into drive hot or cold .... ive not checked the wells for 2 weeks or so but will check again tommorrow in the daylight ... last time they were clear though ..... i know i can reset this code every now and then but i would prefer a fix .....

[feeutfo]

Oh look, vx blaming the ecu again. I'd be trying to get the car to a tech2 with an operator who knows how to use it. So not vauxhall.

[Proz]

Well thats the car back in the Vx garage today to see if they can find out whats making this fault keep coming back  :-/

[Proz]

Mmmm  second new cat fitted on the 10th  and yes the old code has showed up again P0420 in 6 days     ..... wtf can i do now  

[Albatross]

Mmmm  second new cat fitted on the 10th  and yes the old code has showed up again P0420 in 6 days     ..... wtf can i do now  

As I have tried to tell you before; stop wasting money on garages and new cats and move the secondary O₂ sensor to behind the main cat.

[Proz]

Yes i did see your solution for this but since the car was under warranty it wasnt costing anything but now the warranty has expired i will need to see if i can find a garage that can do your fix for me .... thanks  

[Albatross]

Yes i did see your solution for this but since the car was under warranty it wasnt costing anything but now the warranty has expired i will need to see if i can find a garage that can do your fix for me .... thanks  

Some tips:

Be prepared to have replace you lambda sensor. If it has not been out for a long time then the threads can sometimes strip when removing.

Any exhaust place will be able to sell you a lambda sensor "bung" which is a bolt specifically designed to bung / block off the threaded hole where a lambda sensor goes.

Once you have a bung, find /  buy a nut that will thread onto it.

Then take the bung and the nut to any decent welder. Ask him to drill a suitably sized hole (10p peice-ish in diameter) in the exhaust just behind the main cat (make sure it isn't so far back that the lambda sensor lead can't reach).

Then he/she can weld the nut you bought over the hole. Hey presto! a new lambda sensor threaded hole.

Then move the sensor back and block off the original hole with the bung.

If you ever find it not to your satisfaction it is simply a case of switching the bung and the sensor around, which is a 5 minute job.

[Proz]

Ok thanks .... will see if there is any place around here that can do that for me  

[Kevin Wood]

.. and I haven't looked at the Omega's sensors but Lambda sensors are generally M18x1.5 threads, IIRC.

Kevin

[Proz]

.. and I haven't looked at the Omega's sensors but Lambda sensors are generally M18x1.5 threads, IIRC.

Kevin

Ok thanks for that  

[Merlindriver]

Got the Engine Management light on on Friday and dropped into a Vx dealer who said there were a number of codes including a Lambda sensor error and a cat problem.  They cleared the faults and they stayed clear all weekend until today when it came on again at about 60mph.  I've checked the code (now I know how ) and its a 0420.  I'll have a look at the wiring to the Pax side 1st sensor but how do I clear the code?  Is it possible that a faulty sensor can give a 0420 but not a sensor code?

[Proz]

Mmmm  second new cat fitted on the 10th  and yes the old code has showed up again P0420 in 6 days     ..... wtf can i do now  

As I have tried to tell you before; stop wasting money on garages and new cats and move the secondary O₂ sensor to behind the main cat.

Ive got this code back again so after three cats... and now my warranty is finished surely three cats all fail so its got to be an O2 sensor ... anyway i looked at the locations of my O2 sensors and the second one is behind the main cat as in the picture above ....there is nothing ahead of the first O2 sensor unlike the picture ie the pre-cat bulge , the pipes just join together .... so if i change the first O2 sensor where does the wire actually connect .... seems to disappear behind the engine somewhere .
Cheers