How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask jim Your Own Question
jim, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 1317
Experience:  ASE Certified in A6,A8,L1, Plus California Licensed Smog Technician
Type Your Pontiac Question Here...
jim is online now
A new question is answered every 9 seconds

On my second cat, has a on it now. sets cat code in 2 days.

Customer Question

on my second cat, has a walker on it now. sets cat code in 2 days. did rear 02 also, looked slow on scanner. no luck, 2days. car runs great, fuel trims gd,plus/minus 1. any ideas?
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: no,always been 22-23mpg. no fuel regulator issues.
JA: What is the model of your '02 Pontiac?
Customer: 2007/gtp. 87xxxmiles
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: I am, 25 year tech. 2 diff cats and rear 02
JA: Anything else you want the mechanic to know before I connect you?
Customer: that's it. stumped
Submitted: 7 months ago.
Category: Pontiac
Expert:  jim replied 7 months ago.

When diagnosing a PCM code or codes: P0420, P0430, be sure to determine the cause of the converter failure. These converters are not likely to fail without an external cause. Typical causes are: fuel pressure regulator leak, engine misfire, dirty fuel injectors, coolant consumption, etc. Also, be aware that some converters on the market will cause this code or codes due to a lack of oxygen storage capacity. A component that must be in these converters, Cerium, is required to store, then slowly release oxygen. NOTE: P0420 is a bank 1 converter code, P0430 is a bank 2 converter code. If the vehicle has only one converter, then P0430 does not apply.

If this information is helpful, please accept my answer and leave a positive rating.

Expert:  jim replied 7 months ago.

Do you still need with this question?