OM651 - B60 (exhaust back pressure sensor)
Thread Starter
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Joined: Sep 2020
Posts: 11
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E200 W212 Face
OM651 - B60 (exhaust back pressure sensor)
Hey guys,
I am at a dead end. I have replaced the sensor with OM from a local dealer. The sensor shows perfect live readings. Car drives well, however, when I drive for a while(30-40km) and when I turn off the engine. Sometimes when I start it again within a few minutes the car goes into limp mode with p047128 code(the signal offset is outside the permissible range) until I restart the engine. What I have discovered is that when I put the key in ignition on, with the engine not running(0rpms)the readings are high from the sensor. The moment the engine is started the values come to normal. However, that is enough to get the car in limp.
Is it possible that there is an issue with the wirings to the sensor and when they are heated to show different voltage/readings?
This screenshot shows the high value at ignition on/engine off.
The moment the engine is started it goes back to normal reading(close to atmospheric pressure at idle).
Any idea what could be the problem?
I am at a dead end. I have replaced the sensor with OM from a local dealer. The sensor shows perfect live readings. Car drives well, however, when I drive for a while(30-40km) and when I turn off the engine. Sometimes when I start it again within a few minutes the car goes into limp mode with p047128 code(the signal offset is outside the permissible range) until I restart the engine. What I have discovered is that when I put the key in ignition on, with the engine not running(0rpms)the readings are high from the sensor. The moment the engine is started the values come to normal. However, that is enough to get the car in limp.
Is it possible that there is an issue with the wirings to the sensor and when they are heated to show different voltage/readings?
This screenshot shows the high value at ignition on/engine off.
The moment the engine is started it goes back to normal reading(close to atmospheric pressure at idle).
Any idea what could be the problem?
Newbie
Joined: Feb 2021
Posts: 1
Likes: 0
audi a4
B60 pressure senser
Hi the problem you had with back pressure sensor did you get to the bottom of it
and can you tell me where you found the sensor i have an e220 651 2015 plate and live data is showing i have a back pressure of 15.68 psi with the engine off
if you could get back to me it would be nice
Don
and can you tell me where you found the sensor i have an e220 651 2015 plate and live data is showing i have a back pressure of 15.68 psi with the engine off
if you could get back to me it would be nice
Don
Thread Starter
Newbie
Joined: Sep 2020
Posts: 11
Likes: 2
E200 W212 Face
Hi the problem you had with back pressure sensor did you get to the bottom of it
and can you tell me where you found the sensor i have an e220 651 2015 plate and live data is showing i have a back pressure of 15.68 psi with the engine off
if you could get back to me it would be nice
Don
and can you tell me where you found the sensor i have an e220 651 2015 plate and live data is showing i have a back pressure of 15.68 psi with the engine off
if you could get back to me it would be nice
Don
Newbie
Joined: May 2021
Posts: 1
Likes: 0
E220
Hi, I am having exactly the same issues with my e220. Did you ever get to the bottom of what the issues is? Was it the sensor inside the engine bay? If had two other sensors replaced , differential sensor and back pressure one.
Last edited by Ravin Ramloll; May 9, 2021 at 01:36 PM.
Thread Starter
Newbie
Joined: Sep 2020
Posts: 11
Likes: 2
E200 W212 Face
Newbie
Joined: Oct 2024
Posts: 1
Likes: 0
Hey guys,
I am at a dead end. I have replaced the sensor with OM from a local dealer. The sensor shows perfect live readings. Car drives well, however, when I drive for a while(30-40km) and when I turn off the engine. Sometimes when I start it again within a few minutes the car goes into limp mode with p047128 code(the signal offset is outside the permissible range) until I restart the engine. What I have discovered is that when I put the key in ignition on, with the engine not running(0rpms)the readings are high from the sensor. The moment the engine is started the values come to normal. However, that is enough to get the car in limp.
Is it possible that there is an issue with the wirings to the sensor and when they are heated to show different voltage/readings?
This screenshot shows the high value at ignition on/engine off.
The moment the engine is started it goes back to normal reading(close to atmospheric pressure at idle).
Any idea what could be the problem?
I am at a dead end. I have replaced the sensor with OM from a local dealer. The sensor shows perfect live readings. Car drives well, however, when I drive for a while(30-40km) and when I turn off the engine. Sometimes when I start it again within a few minutes the car goes into limp mode with p047128 code(the signal offset is outside the permissible range) until I restart the engine. What I have discovered is that when I put the key in ignition on, with the engine not running(0rpms)the readings are high from the sensor. The moment the engine is started the values come to normal. However, that is enough to get the car in limp.
Is it possible that there is an issue with the wirings to the sensor and when they are heated to show different voltage/readings?
This screenshot shows the high value at ignition on/engine off.
The moment the engine is started it goes back to normal reading(close to atmospheric pressure at idle).
Any idea what could be the problem?
