2000 Ford Focus P0420 Catalyst Code

2000 FORD FOCUS
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JBREVARD
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  • 1 POST
P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

Four instances of the code being generated, each time CarChip reports the engine status as being:
Calculated load value 32.5%
Engine Speed 1837 rpm
Vehicle speed 45 mph

So what's the next step :?:
Feb 4, 2006 at 7:57 AM
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CHEVY350GUY
  • ✓Experienced Mechanic
  • 109 POSTS
sounds like converter, but check o2s first.
Feb 4, 2006 at 8:05 AM
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Suggested Repair

Check the oxygen sensors first. If they are working properly, the catalytic converter is the likely cause of the P0420 code.

Conversation Summary

The owner of a 2000 Focus reported a recurring P0420 code for catalyst system efficiency below threshold on bank 1, occurring at moderate load and speed, and asked for the next step. The expert said it sounds like the converter but recommended checking the oxygen sensors first.

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