I have a 2001 Protege Es 2.0 with about 100k Km (60K miles).
I recently received a P0421 Engine code, cross referenced as "Warm Up Catalyse Efficiency Below Threshold (Bank 1)"
As this probably relates to O2 Sensors or Catalytic Converter, I analysed the O2 sensor voltages on three separate samples.
The Bank 1 forward sensor voltage varies between about .1v and .8v, which I believe is pretty normal.
My question relates to Bank 1 sensor 2. The output voltage is steady at .45 volts for about 2 minutes then starts to vary between .15v and .8v.
Is this a normal output for the sensor?
Any assistance would certainly be appreciated.
I recently received a P0421 Engine code, cross referenced as "Warm Up Catalyse Efficiency Below Threshold (Bank 1)"
As this probably relates to O2 Sensors or Catalytic Converter, I analysed the O2 sensor voltages on three separate samples.
The Bank 1 forward sensor voltage varies between about .1v and .8v, which I believe is pretty normal.
My question relates to Bank 1 sensor 2. The output voltage is steady at .45 volts for about 2 minutes then starts to vary between .15v and .8v.
Is this a normal output for the sensor?
Any assistance would certainly be appreciated.