fuel/ignition code p0420 efficency below threshold bank1.

[geordieric]

hope anyone can help.

have had a fault light checked at my local garage near work

has come up with the following.

fuel/ignition code p0420 efficency below threshold bank1.

have put new ht leads on as seemed to be a stutter/misfire which new leads has got rid of stutter. was thinking airflow meter in or one/both of the lambdas but on a budget so trying to avoid randomnly getting sensors and hoping.

seems to be a possible sucking sound from the engine, easiest heard with bonnet shut, sounds like suckin in a constant pinging kind of way as in noise,

i can sort most things but need a pointer from some pro's.

have been told to chanhe oxy sensers but will it not be something that is causing the sensor not the actual sensor??

cheers

Richie

[stef123]

if you can hear a sucking sound you should check all the vacuum pipes for leaks.

[geordieric]

if you can hear a sucking sound you should check all the vacuum pipes for leaks.

had a quick look but couldnt see anythin. will have a closer look if the weather ever gets above freezin?

cheers