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 Ron Z. Your Own Question
Ron Z.
Ron Z., - Chevy Tech -
Category: Chevy
Satisfied Customers: 18866
Experience:  18+yrs experience. State Inspector and Chevy Diagnostics
Type Your Chevy Question Here...
Ron Z. is online now
A new question is answered every 9 seconds

Chevrolet K1500 silverado pickup: I have a 1998 chevy K1500

This answer was rated:

I have a 1998 chevy K1500 siverado pickup with a 350 5.7L vortec engine,i just put a new engine in 25,000 miles ago.the "service engine soon" light came on about 3 weeks ago,i changed the oil,oil filter,fuel filter,put new spark plugs in,pcv valve,air filter and the light is still on.i had a OBDll scanner put on it and a code (P0420=catalyst system efficiency below threshold"bank 1".meaning the catalytic converters are bad/need replaced. here is my Question?can i keep driving my truck without doing harm to the engine,will the engine stop running.i need about one more month till i have the money to have this problem fixed.let me know what you think.
Hello! Welcome to the site! Thanks for coming! I'm Ron Z. I'm here to provide as much information and insight as I can, to best answer your question.

The P0420 is a very straight forward code pointing to a failing Converter for Bank1. This is the converter on the passenger's side of the vehicle (that actually comes from a pipe on the driver's side). So there is no need to replace both Converters for this code, just that one. As for driving the vehicle- yes, it's perfectly safe to drive. When this code first sets, it's basically just saying that the Converter just isn't "cleaning" the exhaust enough to meet the vehicle's emissions specs. It takes quite some time for the converter to actually "completely" fail and become clogged to the point it causes problems. So, driving another month or so should not be a problem at all. It'll be much longer than that before you start noticing any engine performance symptoms. You have plenty of time.

Please remember the website WILL NOT automatically compensate me with a part of your deposit or from your subscription WITHOUT YOUR RATING! Please use the Rating System and *Rate My Service* if the information/advice I supplied has helped you. If you have any more questions, use the "Reply" tab – I'm always happy to answer follow-up questions! Follow-ups are always FREE! Even after you rate! Thank-you!

Ron Z. and 8 other Chevy Specialists are ready to help you