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What could be wrong with my 2001 Corolla?

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Old 15 Jul 2010, 01:00 pm   #1 (permalink)
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Default What could be wrong with my 2001 Corolla?
OK.So,my 2001 Toyota Corolla's check engine light came on today.I had Autozone do a scan on it,it came up with PO420,P0300,and P0420 again,in that order.I know P0300 is a random misfire,and P0420 is Catalyst inefficiency bank 1.Do you think P0300 is caused by P0420,or vise versa?I know it's not my spark plugs.They've been changed back in October,and the coils are all firing because while it was running,I unplugged them and plugged them back in one at a time and it stumbled every coil I unplugged and plugged back in.So,I know all cylinders are firing.
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Old 15 Jul 2010, 01:01 pm   #2 (permalink)
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You could have a blocked injector, but you could have the wrong kind of plugs also. Toyota cars really like NGK/OEM plugs. P0420 means your cat is toast.
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