What should I do about my Volvo EGR problem?
So far the EGR boost sensor has been replaced, then the boost control valve, then the turbo boost governor, then a new EGR valve was put in. Again the emissions warning light is back on. The car seems to drive normally. Any suggestions on fixing the problem and not spending another load of cash. What year and what engine?
What does the EGR error code p0401 mean?
In the shop’s defense, replacing your EGR valve probably would eliminate the error code, turn off the CEL, and allow you to pass emissions inspection. One thing is certain: the P0401 error code specifically means you have “reduced flow” in your exhaust gas recirculation system.
What’s the diagnostic code for the EGR valve?
Several technical service bulletins for a wide variety of different makes and models have documented different problems associated with the EGR valve system. With some exhaust gas issues you might set a diagnostic trouble code of PO401 or P0402.
What does error code p0401 mean on Chevy Volt?
Getty Matthew Wright has been a freelance writer and editor for over 10 years and an automotive repair professional for three decades specializing in European vintage vehicles. Error Code P0401, which shows up in cars like the Chevrolet Volt, has become infamous for alerting mechanics to a poorly functioning exhaust gas recirculation (EGR) system.
How does an exhaust gas recirculation ( EGR ) valve work?
The EGR (Exhaust Gas Recirculation) valve helps lower the car’s exhaust emissions (gases from the tailpipe). It recirculates the portion of the gasses coming out of the engine by putting in back into the intake manifold, where the engine can burn it again, thereby reducing the emissions. The EGR
What happens when you blank the EGR valve?
The EGR pumps warm used air back into the engine instead of cold clean air. If you were to blank of the EGR, it would continuously get cold air thus an improvement in performance. For people looking for the best performance upgrade (such as myself), a remap with a blanked off EGR will provide excellent results.
When to replace the EGR valve on a diesel engine?
The EGR valve on a diesel engine usually gets a lot more dirt in it, and it has to be replaced and cleaned more often. The carbon build up can also destroy the EGR valve and you have to replace it more often. A lot of people, reprogram the EGR valve to not function to reduce the amount of carbon build up in the engine.