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My check engine light just came on and after performing a scan, the codes P0422 and P0423 are displayed. What do i need to do? Does it mean my catalytic converter or O2 sensors are damaged?

Vehicle: 2004 Mercedes Benz ML350 3.7L
asked by

1 Answer

P0422 The effect of the right-three way catalytic is too low

P0422 Heated catalyst below threshold Bank 1

Not necessarilly does this mean the catytic is non operational, a vehcle that is in good fuel control will also have a longer life of the catalyic, Check for tune up, when it comes to MBZ the sparkplug can get easily fouled. which will affect the perfomance of the catalyic convertor.

answered by (10.8k points)

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