Questions & Answers for: Oldsmobile p0420 code

...code P0420 Does anyone know what that means. try this site: http://www.obd-codes.com/p0420 Yeah, likely the cat converter needs to be replaced. But check out that rear O2 sensor first. Also, another ...

...code P0420 (bank 1) will this correct itself after changing the EGR valve or do I have to change the O2 sensor? Thanks, Paul The 420 will not go away with egr replacement. it means the computer has ...

...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 anyone that may be more specific on either one of these two error codes. ...

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 on what is going

...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 back on, I'm about to give up. p0420 is a converter code how many ...

...code has not since reappeared. I went to Auto Zone. Here are the codes that came up. P0133, P0420, P0420. The guy said the first is an oxygen sensor, which could just be loose. He said it would cause ...

...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 should ...

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

...code . P0420 As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as ...