Passat B6 engine light on, no error codes.
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Joined: Nov 2025
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Passat B6 engine light on, no error codes.
So firstly this isn’t my car, I am doing this for a friend with no mechanic skills at all.
His car is a 2006 VW Passat B6 2litre diesel Auto 140bhp model.
His check engine light is on. He asked me (I am not a professional but lets just say know enough have done every job on a car except re-mesh gears and have even done an ECU clone and have the tools etc) to run my diagnostic tool on his car and I did. Weirdly it came up all clear with no errors which surprised me so I did a little digging.
i have found that this car can turn on the engine light for things that it doesn’t log as errors, such as leaking vacuum pipes and sensors (such as the oxy one). I would expect all of the light on no codes faults I have found so far would cause some noticeable deficits (such as rough idle or running, poor power or fuel economy etc), yet my friend says the car is behaving just as it always has.
Anyone got any ideas of things to look out for on the car that would cause a light-on/no errors that would also be unnoticeable to the driver please?
His car is a 2006 VW Passat B6 2litre diesel Auto 140bhp model.
His check engine light is on. He asked me (I am not a professional but lets just say know enough have done every job on a car except re-mesh gears and have even done an ECU clone and have the tools etc) to run my diagnostic tool on his car and I did. Weirdly it came up all clear with no errors which surprised me so I did a little digging.
i have found that this car can turn on the engine light for things that it doesn’t log as errors, such as leaking vacuum pipes and sensors (such as the oxy one). I would expect all of the light on no codes faults I have found so far would cause some noticeable deficits (such as rough idle or running, poor power or fuel economy etc), yet my friend says the car is behaving just as it always has.
Anyone got any ideas of things to look out for on the car that would cause a light-on/no errors that would also be unnoticeable to the driver please?
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Joined: Jan 2025
Posts: 46
So firstly this isn’t my car, I am doing this for a friend with no mechanic skills at all.
His car is a 2006 VW Passat B6 2litre diesel Auto 140bhp model.
His check engine light is on. He asked me (I am not a professional but lets just say know enough, have done every job on a car except re-mesh gears and have even done an ECU clone and have the tools etc) to run my diagnostic tool on his car and I did, or I could take it to a BMW Service Mooresville for a deeper scan. Weirdly it came up all clear with no errors which surprised me so I did a little digging.
i have found that this car can turn on the engine light for things that it doesn’t log as errors, such as leaking vacuum pipes and sensors (such as the oxy one). I would expect all of the light on no codes faults I have found so far would cause some noticeable deficits (such as rough idle or running, poor power or fuel economy etc), yet my friend says the car is behaving just as it always has.
Anyone got any ideas of things to look out for on the car that would cause a light-on/no errors that would also be unnoticeable to the driver please?
His car is a 2006 VW Passat B6 2litre diesel Auto 140bhp model.
His check engine light is on. He asked me (I am not a professional but lets just say know enough, have done every job on a car except re-mesh gears and have even done an ECU clone and have the tools etc) to run my diagnostic tool on his car and I did, or I could take it to a BMW Service Mooresville for a deeper scan. Weirdly it came up all clear with no errors which surprised me so I did a little digging.
i have found that this car can turn on the engine light for things that it doesn’t log as errors, such as leaking vacuum pipes and sensors (such as the oxy one). I would expect all of the light on no codes faults I have found so far would cause some noticeable deficits (such as rough idle or running, poor power or fuel economy etc), yet my friend says the car is behaving just as it always has.
Anyone got any ideas of things to look out for on the car that would cause a light-on/no errors that would also be unnoticeable to the driver please?
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