'02 Isuzu Rodeo 4cyl GM engine p0420 and car won't start

160,000 MILES
Avatar
TAYLORC
  • MEMBER
  • 1 POST
Car stranded us. Plenty of power but wouldn't start, then hours later would suddenly turn over with no problem. Our mechanic ended up replacing broken/worn radiator return hose, then when it still wouldn't run, mechanic replaced head gasket (small oil leak)and spark plugs. Still kept cutting off, then ended up replacing the ECM which had to be flashed to car. Import dealership said it was still throwing a code, but our mechanic said it wasn't on his machine and pronounced it fixed. Weeks later, now selectively not starting, driving normal then seems like no power, to now not even starting at all. The last drive in it, check engine light came on, code p0420. Catalytic converter? This car has two. Second question? Was it the cat all the time and we got taken? Thanks for ANY help with this.
Jun 7, 2012 at 3:52 PM
Advertisement
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
no, not the cat all the time. just worn out and needs to be replaced

start with a fuel pressure test.

Roy
Jun 7, 2012 at 4:00 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle