what does this code mean - 497D

Dontworry · 02-24-2020, 05:52 PM

Hi all,

i would like to know what the does the following error mean, i can clear the code, but if i switch the car off after running it comes back up, and does anyone know i can fix it,

497D - Pressure sensors,plausibility under after run: Exhaust gas pressure before the turbo charger not reasonable in relation to ambient pressure,

Many thanks

Trunks85 · 02-25-2020, 03:11 AM

It could be the EGR however I would start with the Exhaust Pressure Sensor as that seems to be what the code refers to. What the code is telling you is that the ECU is getting a signal that the pressure before the turbo is outside of a set parameter, this could be due to a leak, blockage or faulty sensor. I'd start with the sensor. The sensors retail for about £30 online.

Tambohamilton · 02-25-2020, 04:41 PM

I can't see how that could be an EGR fault. EGR faults always come with a MAF fault, because the MAF readings don't add up correctly when EGR is misbehaving.

Have a look at the pressure sensor and its connections before spending any money. There will be a rubber tube between the manifold and the sensor; make sure it's not split. Check the wires etc. If it all looks to be physically sound, go ahead and replace the sensor itself.

02-24-2020, 05:52 PM	#1
Dontworry New Member 4 Rep 23 Posts Drives: 2010 320i Business edition Join Date: Feb 2017 Location: London iTrader: (0)	what does this code mean - 497D - Pressure sensors Hi all, i would like to know what the does the following error mean, i can clear the code, but if i switch the car off after running it comes back up, and does anyone know i can fix it, 497D - Pressure sensors,plausibility under after run: Exhaust gas pressure before the turbo charger not reasonable in relation to ambient pressure, Many thanks
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02-25-2020, 03:11 AM	#2
Trunks85 Trunks 3 Rep 9 Posts Drives: BMW e90 Join Date: Jul 2018 Location: Ireland iTrader: (0)	It could be the EGR however I would start with the Exhaust Pressure Sensor as that seems to be what the code refers to. What the code is telling you is that the ECU is getting a signal that the pressure before the turbo is outside of a set parameter, this could be due to a leak, blockage or faulty sensor. I'd start with the sensor. The sensors retail for about £30 online.
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02-25-2020, 04:41 PM	#3
Tambohamilton Brigadier General 3058 Rep 3,909 Posts Drives: E91 330d Join Date: Apr 2019 Location: Herefordshire iTrader: (0)	I can't see how that could be an EGR fault. EGR faults always come with a MAF fault, because the MAF readings don't add up correctly when EGR is misbehaving. Have a look at the pressure sensor and its connections before spending any money. There will be a rubber tube between the manifold and the sensor; make sure it's not split. Check the wires etc. If it all looks to be physically sound, go ahead and replace the sensor itself.
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