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Fiesta Mot Fail. Help

MOT Lambda sensor help

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#1 rhanco1

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Posted 09 June 2014 - 08:51 AM

Hi All,

My 04 Fiesta 1.4 failed the MOT on omissions.

The reading when idle was 1.4. It should have been 0.3.

The garage wants to charge me £50 to put it on diagnostic machine but implied it was the lambda sensor.

Is this correct and if so which sensor would it be. Front or back.



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#2 martyntdci

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Posted 09 June 2014 - 08:56 AM

the lamba sensor should sit around the cat area on the exhaust system....

 

try a bottle of cataclean cost 11 quid from euro, this states to do amazing things with the whole combustion chamber, injectors and the whole exhaust system..

 

maybe giving it a service and a good Italian tune is in order?



#3 rhanco1

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Posted 09 June 2014 - 09:01 AM

Just had service and motorway driving regularly.

Drives really well. Only mild lurch when first started in the morning then no problems.



#4 martyntdci

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Posted 09 June 2014 - 09:08 AM

im presuming its petrol.....

 

chuck a bottle of cataclean in, when tank is 1/4 full n take it for a drive..... this is what ive done with my 1.8tdci, i have noticed must difference to be honest, but it kick's out less smoke than before



#5 martyntdci

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Posted 09 June 2014 - 09:17 AM

says on the bottle lol

 

 

cataclean.JPG

 

 



#6 jeebowhite

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Posted 09 June 2014 - 11:52 AM

Lambda sensor is certainly a likely falling point for that part of the MOT, definatey worth trying to give it a clean and boot it down the motorway.

 

Failing that, you could have a leak somewhere, either the inlet manifold is partly damaged (split or crack) or perhaps a pipe or hose is split around the air intake (after the MAF sensor).



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