Question about BMW 325
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Posted on Jan 02, 2017
SOURCE: engine error lite P0465
Replacing the EGR valve, its actuator, or your DPFE sensor could all be at fault. I would probably start with the valve itself since it's an EGR leak code. Your gas cap was a wasted repair. The gas cap would cause a P0441 or 445 evap code, but not an EGR code.
Posted on Oct 07, 2009
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Info found at: http://www.obd-codes.com/p0456
Maybe try cleaning, tightening, or replacing the gas cap first?
P0456 Article by Dale Toalston ASE Certified Technician
Evaporative Emissions System - Small leak detected
The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the fuel tank pressure (FTP) sensor. When the sensor indicates a small leak in the EVAP system, this code is set.
There will likely be no noticeable symptoms other than the Malfunction Indicator Lamp (MIL). This is because the EVAP system is a closed system and only controls fuel tank vapors, not engine management.
Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened. Any of the following could also be the cause: - A small leak in any of the EVAP hoses or fuel tank hoses - A small leak in the purge valve or vent valve - The EVAP Canister may be leaking Possible Solutions:
- A small leak in any of the EVAP hoses or fuel tank hoses
- A small leak in the purge valve or vent valve
- The EVAP Canister may be leaking
First, using a scan tool activate the vent solenoid, sealing the system. Then monitor the fuel tank pressure (FTP) sensor. If the system is sealing properly, the number will stay consistent. If is isn't, the pressure sensor will show that as well. If the system slowly leaks, use a smoke machine and watch for smoke exiting the system at any EVAP component. Any where there is smoke exiting the system, that is the faulty component. Do not pressurize the EVAP system with air pressure. Doing so can damage the purge and vent solenoids in the system.
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