What is the EGP fault in the engine?
3 Answers
Engine EGP refers to a fault in one or both of the two temperature sensors, involving either the circuit or the internal components of the sensor itself. This fault may be caused by a short circuit, an open circuit, or a malfunction in the temperature sensor. Solution reference: Replace both sensors. Exhaust processor: The exhaust processor is equipped with two catalytic converter temperature sensors and one NOX sensor. The two temperature sensors are located at the inlet and outlet of the catalytic converter, respectively referred to as the inlet and outlet temperature sensors. Main function: The main function is to detect the temperature of the exhaust gases emitted by the engine. When the detected exhaust temperature exceeds 200°C, the engine's electronic control unit receives this signal and sends corresponding execution signals to the metering injection pump to control the injection of a certain amount of urea solution into the exhaust pipe. The urea solution decomposes into NH3 when heated, and NH3 reacts with NOX in the exhaust gases to produce non-polluting N2 and H2O.
I've been in auto repair for many years, and EGR failures are quite common. It's a problem with the Exhaust Gas Recirculation system, which essentially recycles exhaust gases from the tailpipe back into the engine for re-burning, aiming to lower emission temperatures and reduce pollution. However, frequent issues include the EGR valve getting stuck due to carbon buildup, faulty sensors, or aging wiring—especially in older cars that have been driven for several years. When this happens, the car may shake as if misfiring, feel sluggish with poor acceleration (like the throttle isn't responding), and the dashboard often lights up with warning indicators, most commonly the check engine light. Sometimes, the exhaust smells foul, and fuel consumption spikes. For diagnosis, it's best to use an OBD scanner to read trouble codes and pinpoint the issue. Typically, the EGR valve needs to be removed for carbon cleaning or outright replacement. Ignoring it can lead to engine overheating and component damage, making repairs costlier over time. My advice to car owners is not to delay once symptoms appear—get it checked at a professional shop ASAP to save money in the long run.
I once encountered an EGR issue with my decade-old Toyota. Suddenly, the car struggled to accelerate and shook violently during takeoff, with the yellow engine light on the dashboard startling me. A quick check under the hood revealed nothing unusual, but accelerating resulted in rough running and black smoke from the exhaust. A friend suggested the EGR system was clogged, preventing exhaust gas recirculation and affecting combustion. I tried cleaning around the intake manifold at home, but the problem persisted. Eventually, I had to spend a few hundred dollars at the repair shop to replace the faulty part. For regular car owners facing similar issues, it's risky to tackle it alone—better note symptoms like unstable idling or cold start difficulties for the mechanic's reference. Early intervention saves both peace of mind and fuel.
