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How to Repair P0453 on 99' Disco II 125k miles

  • how to repair P0453 ?

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  • good LR repair person or shop in Las Vegas

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Discussion Starter · #1 ·
Having a on going problem with my 99' Discovery II (125,000 miles). Can not figure out why I keep getting a service light for P0453... Replaced fuel pump with OEM pump and still throwing code. Took it to a LR dealer here in Las Vegas... Couldn't figure it out... Wanted me to leave it with them a few weeks... $$$$$... Can someone give me any suggestions or know of a GOOD LR repair shop in Las Vegas. I love my Rover, and it always runs. Had to drive her while looking over my shoulder for COPS due to not being able to register her... This is the only code she is throwing... HELP

Cutaway101
 

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Borrowed this from the internet. A shop that does emissions related repairs should be able to make sense of it for you if you are not mechanically inclined.
P0453.....
What does that mean? The EVAP (Evaporative Emissions) System allows fuel tank vapors to be purged into the engine and burnt rather than expelled into the atmosphere as harmful emissions. The EVAP system contains a pressure sensor to check the integrity of the system. Periodically, the EVAP system performs a pressure test to check that there are no leaks in the system. It uses this sensor, also known as a fuel tank pressure (FTP) sensor to check for leaks. Basically P0453 means the PCM (Powertrain Control Module) noticed the EVAP Pressure sensor or FTP is indicating a higher than normal pressure (above 4.5 Volts) in the EVAP system. NOTE: On some vehicles the FTP is a part of the fuel pump assembly in the tank. Potential Symptoms There will likely be no noticeable symptoms along with this code other than the MIL (Malfunction Indicator Lamp), commonly known as Check Engine Light illumination. However, there may be noticeable fuel odors in some cases. Causes A P0453 DTC trouble code may be caused by one or more of the following: Open on FTP sensor signal wire Short to voltage on FTP sensor signal wire Bad FTP sensor Abnormally high pressure in fuel tank due to blockage in EVAP purge hoses or overfilled tank Loose/damaged FTP sensor connector Loss of ground to the sensor Possible Solutions Using an scan tool access FTP sensor value with Key on Engine off (KOEO). Normal value is usually somewhere near 2.5 Volts at atmospheric pressure (may fluctuate some due to altitude). It shouldn't ever be above 4.5 Volts. 1) If it is close to 2.7V with the gas cap off, the problem is likely intermittent. Using a Digital Volt Ohm Meter, measure the voltage on the signal wire while trying to induce the problem by wiggle testing all the wiring at the FTP sensor. If the voltage fluctuates when wiggle testing, check for connector problems; i.e. water in the connector, broken or chafed wiring. 2) If the value shown on the scan tool is above 4.5V, unplug the sensor (if possible) and check for voltage again. If the high voltage is still present when unplugged, inspect wiring harness for a short to voltage on the signal wire. If the high voltage disappears when unplugging the sensor, check for a good ground to the sensor and proper reference voltage. If you have a good ground and 5 Volts reference voltage, replace the FTP sensor since it's likely shorted out.

Read more at: P0453 DTC Evaporative Emissions Control System Pressure Sensor High Input
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Isn't the sensor connected to the pump? (on the inside of the tank) Wiring harness has no cracks or loose nor worn wires. Months after new pump install. Still drives and runs great, but still throwing P0453 code!
 
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