Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Sfi system / Catalyst system efficiency below threshold

Toyota Corolla (E120): Catalyst system efficiency below threshold

Dtc p0420 catalyst system efficiency below threshold (bank 1)

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On–vehicle inspection
1. Inspect brake booster Airtightness check.  Start the engine and stop it after 1 or 2 minutes. Depress the brake pedal several times slowly. Hint: if the pedal goes down farthest at the 1st time, but gradually rises after the 2nd or 3rd time, the booster is airtight. ...

Replacement
1. Drain brake fluid Notice: wash the brake fluid off immediately if it comes into contact with any painted surface. 2. Remove air cleaner cap sub–assy 3. Remove air cleaner case sub–assy  remove the air cleaner element, then remove the 3 bolts and air cleaner case sub–assy. ...

Rear axle lh hub bolt
Replacement Hint: components: 1. Remove rear wheel 2. Remove rear brake drum sub–assy 3. Remove rear axle lh hub bolt Using sst and a hammer handle or an equivalent, remove the lh hub bolt. Sst 09628–10011 4. Install rear axle lh hub bolt Install a washer and nut to a ...