Hi,
I have a stock 2010 v6. I am pulling codes for all the emissions : P0433, P0403, P0135, P0155, P0141, P0161. I replaced the egr valve on dealer recommendation and reset codes. Fuses are ok. Do I need to replace the pcm?

 

If you replace the PCM, the replacement will yield the same codes. They are inter-related. The EGR valve itself may not have been at fault, but rather the DPFE sensor which gives valve movement data to the PCM. All other codes are related to all 4 oxygen sensors, and would be highly unlikely to occur all at once due to faulty sensors, unless serious damage was done mechanically to the harness supplying power to all 4 sensors. More likely, the cat converters are causing the 4 heater codes to present.


How many miles are on the car? imp

 

I have 211000 kilometres....about 120000 miles. Do you think a bad cat could do it?

 

I believe so, yes. I say this based on many conversations, and my own case, 2004 Explorer with 4.0L V-6, which has thrown "02 Sensor Heater Resistance Bank 1 Pos 2" for many months now. Sensors were all replaced, wiring to them replaced, even though no continuity or abnormal resistance values were noted. At one point, I hammered on the cat, the CEL stayed off over 1,000 miles, then returned. I plan to replace the cats. imp

 

Cats aren't cheap so before you simply replace them, see if your area has a shop that puts cars on an emissions dyno. It might cost $100 in canadian but it's still way cheaper than the $800+ for cats.

That will give them a reading on the output of the exhaust gas and mixtures of various components you are getting. If some components of the exhaust fumes are off/incorrect, it can give you a better idea if it's possibly cat related or something else.