They disconnect the tube that connects the exhaust manifold to the exhaust pressure sensor and try to run air through it. Then they proceed by checking the exhaust back pressure sensor. If they do come back, then that means there’s an actual problem. The codes are then reset and the vehicle will be taken to test drive to see if the error codes come back. This is to gather stored data that will tell the mechanic the different codes stored in the vehicle’s computer, and give him a better idea on how to advance in diagnosis and conduct repair. Leaks in the exhaust gas recirculation system, air inlet or charge air leaksĪs with other trouble codes, mechanics start their diagnosis for Error Code P0471 by connecting an OBD-II scanner to the onboard computer of the vehicle.Blocked or clogged tube that runs from pressure sensor to the exhaust manifold.Poor electrical connection with exhaust back pressure sensor circuit.Shorted or open exhaust back pressure sensor.There are a number of things that could cause Error Code P0471, including the following: This problem can lead to crank-no-start condition.Common SymptomsĪs with other trouble codes, P0471 triggers the Check Engine light. Troubleshooting can vary from one manufacturer to another, type of engine (gas or diesel), exhaust pressure sensor types and wire colors. The only difference between the two is the length of time the problem lasts, as well as the type of electrical or mechanical problem that the sensor, circuit or engine controller is having. This usually happens in vehicles that turbocharged and diesel engines.Įrror Code P0470 can also be present, and P0470 and P0471 are actually related codes. This can be caused by a fault in the electrical circuit or a mechanical failure. This code happen when the incoming signal from the exhaust pressure sensor not matching the pressure from the intake manifold or ambient pressure at key on. DefinitionĮrror Code P0471 takes place when the PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) has detected a voltage reading a voltage reading that is out of the normal range for the exhaust system back pressure sensor circuit. That’s not to say you wouldn’t necessarily get this code in a VW or other make though. This trouble code is a generic error code, which means it applies to all vehicles with variable nozzle turbochargers (diesel or gas), or vehicles made since 2006 on Ford trucks equipped with 6L diesel engines, Ford EcoBoost engines and the Cummins 6.7L in 2007, the 3.0L in the Mercedes lineup in 2007 and here recently the Cummins 3.0L 6 cyl in the Nissan pickups starting in 2015. This means the PCM has detected a voltage that is out of the normal range, a problem caused by exhaust back pressure system.

Error Code P0471 is defined as Exhaust Pressure Sensor Range/Performance.

2015 mazda 6 p0171