Home/Toyota/MR2/Toyota MR2 W30 (1999-2007)/Repair manual/Testing & Diagnostics/DTC P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD
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DTC P0420: CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD Toyota MR2 W30

Testing & Diagnostics 1 illustration

Note. Heated oxygen sensor for cylinders No. 1 and 4 is referred to as bank 1 sensor 1 and is located at timing chain end of exhaust manifold above catalytic converter. Heated oxygen sensor for cylinders No. 2 and 3 is referred to as bank 2 sensor 1 and is located at flywheel end of exhaust manifold, above catalytic converter.

Circuit Description

For circuit description (Scheme 226)

Scheme 226

Scheme 226: Circuit Description