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P0472 is a diagnostic trouble code (DTC) for "Exhaust Pressure Sensor Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0472 code means there is a problem with your vehicle’s electrical circuit, though the source could be electrical or mechanical. It stems from an exhaust back pressure sensor not working correctly.
A P0472 code concerns the incoming signal sent by the exhaust pressure sensor because it’s not coinciding with the intake manifold pressure or ambient air pressure. The problem is strictly related to an issue with the electrical circuit. It often occurs with the P0473 code as well.
There are a number of reasons you could be seeing the P0472 code displayed:
If possible, a PCM flash/reprogram protocol
Checking the exhaust pressure sensor, inspecting its connectors and wiring for rubbing, chafing, burn spots, bare wires, and melted plastic
Taking the connectors apart, inspecting for corroded or burnt terminals and possibly cleaning them
Clearing the diagnostic trouble codes from memory using a scan tool to see if the code returns. If it does, the sensor and various circuits will need to be tested.
Disconnecting the harness that leads to the exhaust pressure sensor with a DVOM (digital volt/ohm meter) and testing the power supply circuit that runs to the sensor to make sure it is powered up.
The most common reason the P0472 code gets misdiagnosed is because it gets confused with an exhaust gas recirculation code. Even though the exhaust back pressure tube may be found close to the exhaust gas recirculation (EGR) valve, the P0472 code still needs to be diagnosed in a completely different way.
Although it’s not a code that represents extreme danger, it’s still a good idea to have a qualified mechanic take a look ASAP if you see P0472 displayed. Your engine simply isn’t performing as well as it could be which is only going to lead to more problems in the future. Worst case scenario, though, your vehicle may stop working completely even while you’re driving on the road, which could obviously be pretty scary (or at least very inconvenient).
Associated codes like P0471 and especially P0473 may occur along with P0472. They all relate to the same core issue, though, so addressing P0472 should clear out the others too.
The moment you see a P0472 code, contact YourMechanic and schedule an appointment with one of our certified mobile mechanics. You can sign up through our website or by calling us at 1-800-701-6230. The mechanic will then travel to either your home or place of business whenever is most convenient. We’d be happy to supply you with a quote first as well.