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Dan, Technician
Category: Nissan
Satisfied Customers: 23789
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Titan: Yes sir I have a 2004 Nissan Titan 107K miles with P0420

Customer Question

Yes sir I have a 2004 Nissan Titan 107K miles with P0420 & P0430 codes. Engine hesitates on acceleration. Fue consumption increased, changed plugs and filter, used gas treatment higher octane gas no change. Reading some forums indicate plugging cat converter??
Submitted: 1 year ago.
Category: Nissan
Expert:  Dan replied 1 year ago.
Hello, my name is ***** ***** I'm here to help get your problem solved. I agree this means your catalytic converter has clogged. You can remove front oxygen sensor and install pressure gauge. If pressures goes over a few psi while reving engine then replace the converter. Let me know how it goes or if you have more questions, thanks.
Customer: replied 1 year ago.
Thanks heard it be a cracked exhaust manifold also?
Expert:  Dan replied 1 year ago.
It could be but that is not as common. It could be any exhaust leak but more likely failed converter. Let me know how it goes, thanks.