Light diagnosed again-

andysat

Lifer
Hi all-took zed to indy today, fault code 29F4 again P420.Indy said to me he does not know how to advise me now :(
 
mac27040 said:
29F4 (P0420) - Catalyst System


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Yeah-he basically said they could replace the cat and the light still come on, exactly what the stealers told me last year :roll:
 
Could be a faulty O2 sensor, also make sure you use decent fuel not supermarket fuel


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mac27040 said:
Could be a faulty O2 sensor, also make sure you use decent fuel not supermarket fuel


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Had two replaced within weeks of each other(diagnosed one , then couple of weeks later when light came on again-said oh it must be the other one! :roll: , no supermarket has been near the zed in my ownership)
 
Hi Andy,
has anyone checked the wiring ?, maybe try to find a good Auto electrician and get him to have a look at it, If the Cats been changed and both sensors that's the direction I'd be going or else take the F"£$%ing bulb out !!

I Feel for you, I know this has been coming and going for a long time, good luck :)
 
fixit man said:
Hi Andy,
has anyone checked the wiring ?, maybe try to find a good Auto electrician and get him to have a look at it, If the Cats been changed and both sensors that's the direction I'd be going or else take the F"£$%ing bulb out !!

I Feel for you, I know this has been coming and going for a long time, good luck :)
Cat has not been changed-everything else has though :roll: -funny you should say that though, the last time it came on (and I turned it off myself) the car was travelling over very bumpy ground for a couple of miles.
 
andysat said:
fixit man said:
Hi Andy,
has anyone checked the wiring ?, maybe try to find a good Auto electrician and get him to have a look at it, If the Cats been changed and both sensors that's the direction I'd be going or else take the F"£$%ing bulb out !!

I Feel for you, I know this has been coming and going for a long time, good luck :)
Cat has not been changed-everything else has though :roll: -funny you should say that though, the last time it came on (and I turned it off myself) the car was travelling over very bumpy ground for a couple of miles.

Can't see a Cat. having an intermittent problem like that,unless you're driving is connected... small journeys clogging up the Cat., but I think you would've made that connection by now If it was the case, so I would say check the wiring, sounds like a false indication to me !
 
fixit man said:
andysat said:
fixit man said:
Hi Andy,
has anyone checked the wiring ?, maybe try to find a good Auto electrician and get him to have a look at it, If the Cats been changed and both sensors that's the direction I'd be going or else take the F"£$%ing bulb out !!

I Feel for you, I know this has been coming and going for a long time, good luck :)
Cat has not been changed-everything else has though :roll: -funny you should say that though, the last time it came on (and I turned it off myself) the car was travelling over very bumpy ground for a couple of miles.

Can't see a Cat. having an intermittent problem like that,unless you're driving is connected... small journeys clogging up the Cat., but I think you would've made that connection by now If it was the case, so I would say check the wiring, sounds like a false indication to me !
Where would I start?-under the car around the sensors?-would the fault code be different though?
 
I don't think code readers are clever enough to determine If It's wiring or the sensor, it just points you in the right direction.

With wiring diagram in hand check for continuity on all the wires going to from the sensors that are connected with that system, also check for continuity to ground in case a wire is shorting to ground, while shaking the wires, also visually check the wires for Chafing, check the routing of the wires where they go through holes or around corners ...usual places for chafing !
 
fixit man said:
I don't think code readers are clever enough to determine If It's wiring or the sensor, it just points you in the right direction.

With wiring diagram in hand check for continuity on all the wires going to from the sensors that are connected with that system, also check for continuity to ground in case a wire is shorting to ground, while shaking the wires, also visually check the wires for Chafing, check the routing of the wires where they go through holes or around corners ...usual places for chafing !
I will have to have a look at this, thanks for the advice.
 
no problem, hope you find something, here's a link to a wiring diagram that Bcwerkz just posted :-

http://www.bmw-planet.com/diagrams/release/en/e85/index.htm

copied and pasted again, hopefully it works now , If not scroll down to the post about wiring Diagram by Nova2k7

Edit, to find the diagram... Index, Complete vehicle, Exhaust system, Lambda control ..something like that, just make sure you have the correct engine !
 
fixit man said:
no problem, hope you find something, here's a link to a wiring diagram that Bcwerkz just posted :-http://www.bmw-planet.com/diagrams/release/en/e85/index.htm
Cheers I cant seem to get it to work?
 
Andy - get rid of yours and buy Cueball's 3.0, as suggested by MM on the FS thread. Bargain, beautiful car, more horses. Enough is enough, surely ?

Edit - even though it would involve a trip up North, the pain/expense/enjoyment equation must be broken enough to think about it...
 
My light was on for over a year and it took an auto electrician to finally resolve the problem. He took the fuse box out and gave all the connections a good clean and this fixed it. In my case the code was always p1414 which is to do with the secondary air pump.

Cheers
 
Bing said:
Andy - get rid of yours and buy Cueball's 3.0, as suggested by MM on the FS thread. Bargain, beautiful car, more horses. Enough is enough, surely ?

Edit - even though it would involve a trip up North, the pain/expense/enjoyment equation must be broken enough to think about it...
Cheers mate, you have got a point but it would be nice to just get mine sorted out once and for all.
 
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