Questions & Answers for: Oldsmobile p0420

...ran fine yesterday and today it would start for my wife. Ran diagnostic and it threw up error code P0420 Does anyone know what that means. try this site: http://www.obd-codes.com/p0420 Yeah, likely ...

Getting DTC code P0404 and P0420. What should I do? I have a DTC code P0404. Should I change the EGR valve and where is it on the engine? Also DTC code P0420 (bank 1) will this correct itself after ...

Error codes: P0420 AND P0446 1996 Oldsmobile Bravada 4.3 liter. Error code: P0420 and will not pass emissions. Also code: P0446, I realize that the P0420 may be a 02 sensor, but I am looking for ...

I was getting a p0420 code on my 2001 alero and now when I reset the light I am getting a p1133 code. I did put gas treatment into the full tank of gas and then the p1133 code came on. any suggestion ...

I'm having trouble with a continuing trouble code being set the code is P0420, I've replaced both 02 sensors and checked all other systems all seam to be ok then at about 600 miles the light comes ...

p0420 catalyst effiency below threshold bank 1 Replace the catalytic converter.

fault code P0420 This Code means your Catalytic converter is not working like it should.  You may have a problem on Bank 1 or the O2 sensor is giving you false readings.  At a minimum you ...

P0420 code for olds Aurora 2003. Engine missing after warming up. The P0420 meas Catalyst System Efficiency Below Threshold (Blank 1)________________--Nissan Pin Code calculator

Code P0420 on 2001 Olds Bravada Check engine light comes on, but unable to locate all the sensors to check for open or closed circuit. Inefficient Catalytic Converter(s) Defective Front or Rear Oxygen

...computer die?wont start new fuelpump so where do i go from here ? new computer or what p0172,p0300,p0420,p0446,p0452,p0453,p1639,p1653,p1651,p1652 Take it to a ASE certified repair facility ,they'll ...