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??