What does code P0403?
Diagnostic trouble code (DTC) P0403 stands for “Exhaust Gas Recirculation “A” Control Circuit.” It activates when the PCM detects that the desired and actual states of the EGR control circuit do not match during operation. On modern vehicles, the PCM controls the EGR valve.
When was the exhaust gas recirculation system invented?
In the 1960’s, the automotive industry experienced a renaissance with the invention and introduction of the exhaust gas recirculation (EGR) system. The intent of this system, which was launched in 1966, was to find a way to reduce the particulate matter or “smog” that would flow from vehicle exhaust pipes.
How often should an exhaust gas recirculation system be cleaned?
However, due to its location and the fact that hot exhaust gases flow through it frequently, it can wear out or develop cracks or holes which renders the EGR system useless. To avoid system failure, many mechanics recommend having the EGR system cleaned every 50,000 miles.
Why are exhaust gas recirculation tubes worn out?
In fact, there are vehicles on the road today with the same EGR tubes that were installed by the factory in the 1960’s. However, due to its location and the fact that hot exhaust gases flow through it frequently, it can wear out or develop cracks or holes which renders the EGR system useless.
How does the exhaust gas recirculation system work?
It is a part of the vehicle’s exhaust gas recirculation (EGR) system, an emissions system designed to recirculate exhaust gases back into the vehicle’s intake in order to reduce cylinder temperatures and NOx emissions. The EGR valve is one of the main components controlling the flow and recirculation of these exhaust gases.
What are the symptoms of a bad exhaust gas recirculation?
Symptoms of a Bad or Failing Exhaust Gas Recirculation (EGR) Valve. 1 1. Engine Performance Issues. Another common sign of a bad EGR valve is engine performance issues. A clogged or malfunctioning EGR valve can disrupt 2 2. Rough Idle. 3 3. Pinging or Knocking Soud During Acceleration. 4 4. Check Engine Light Comes On.
How is exhaust gas recirculated in a PCM?
Design details of EGR systems vary rather widely, but the PCM generally calculates the actual amount of exhaust gas being recirculated by monitoring changes in the manifold pressure as the gas is being introduced, or prevented from entering the manifold.
How much does an exhaust gas recirculation valve cost?
Symptoms of a Bad or Failing Exhaust Gas Recirculation (EGR) Valve. $145.34 – $887.80. Average rating from 288 customers who received a Exhaust Gas Recirculation/EGR Valve Replacement. The exhaust gas recirculation valve is a component commonly found on many road-going vehicles.