Code P0420

[corollayaris]

Hi everybody , i have a yaris verso just after i bought the car the dreaded engine malfunction light came on. i got the garage where i bought the car from to diagnose the fault and they said , you need a new lambda sensor , which i had fitted at a cost of £140 ( the sensor was replaced on bank number 1) they reset the light and guess what! yep it came on again while i was on holiday so i got the local toyota garage to check the fault again and they said they

found fault code p0420 and cleaned the sensors on the airflow meter, which 99 % of the time would cure the problem but if the light came back on it would need a new airflow meter, and charged me £17.50 which was brilliant.

Driving back home the light came on again , so i booked the car into a toyota dealer near me and they diagosed the fault again charging me over a £100 ! and said you need a new cat! cost £1100!!! i took the car away from them and took it to my local independant garage who said he would fit me a cat for about £200 but first advised me to have an emission check and guess what? it passed the emission check!

so now i am totally confused and will just carry on driving the car but that light just bugs me. so to anyone whos told they need a new cat i say get a second opinion !

does anybody have any ideas about what the problem is?

many thanks

[tspirit888]

Hi everybody , i have a yaris verso just after i bought the car the dreaded engine malfunction light came on. i got the garage where i bought the car from to diagnose the fault and they said , you need a new lambda sensor , which i had fitted at a cost of £140 ( the sensor was replaced on bank number 1) they reset the light and guess what! yep it came on again while i was on holiday so i got the local toyota garage to check the fault again and they said they

found fault code p0420 and cleaned the sensors on the airflow meter, which 99 % of the time would cure the problem but if the light came back on it would need a new airflow meter, and charged me £17.50 which was brilliant.

Driving back home the light came on again , so i booked the car into a toyota dealer near me and they diagosed the fault again charging me over a £100 ! and said you need a new cat! cost £1100!!! i took the car away from them and took it to my local independant garage who said he would fit me a cat for about £200 but first advised me to have an emission check and guess what? it passed the emission check!

so now i am totally confused and will just carry on driving the car but that light just bugs me. so to anyone whos told they need a new cat i say get a second opinion !

does anybody have any ideas about what the problem is?

many than

[tspirit888]

Hi everybody , i have a yaris verso just after i bought the car the dreaded engine malfunction light came on. i got the garage where i bought the car from to diagnose the fault and they said , you need a new lambda sensor , which i had fitted at a cost of £140 ( the sensor was replaced on bank number 1) they reset the light and guess what! yep it came on again while i was on holiday so i got the local toyota garage to check the fault again and they said they

found fault code p0420 and cleaned the sensors on the airflow meter, which 99 % of the time would cure the problem but if the light came back on it would need a new airflow meter, and charged me £17.50 which was brilliant.

Driving back home the light came on again , so i booked the car into a toyota dealer near me and they diagosed the fault again charging me over a £100 ! and said you need a new cat! cost £1100!!! i took the car away from them and took it to my local independant garage who said he would fit me a cat for about £200 but first advised me to have an emission check and guess what? it passed the emission check!

so now i am totally confused and will just carry on driving the car but that light just bugs me. so to anyone whos told they need a new cat i say get a second opinion !

does anybody have any ideas about what the problem is?

many thanks

might sound strange but there is a vent hose under the air box / manifold area that very often comes detatched and causes the management light to come on and guess what its p0420 hope this helps

[Kcs]

might sound strange but there is a vent hose under the air box / manifold area that very often comes detatched and causes the management light to come on and guess what its p0420 hope this helps

Hi m8, do you have any more info on the air box/manifold pipe ?

Cheers

Kcs