I recently bought Audi A6 C5 2.4L, the check engine light on the dashboard is off but I know it should be on because I scanned it with an OBD scanner tool besides the check engine light is not turning on even when I turn on the ignition.
So I know for sure there is something wrong with the check engine light itself on the dashboard, I already removed and checked the dashboard but it looks fine the led seems to be okay. So my last guess is there is something wrong with the fuse for the check engine light or the wires, but I don’t know which fuse is responsible for the check engine light. Any advice would be appreciated.
LightYear1
12-15-2022, 04:21 AM
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There is no fuse for the check engine light. It is quite likely that a previous owner has disabled the light, which is an LED, so that he didn’t have to look at it. You might be able to replace the led yourself, or install a cluster with the led functioning.
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georgeb944
12-15-2022, 06:17 AM
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Not every scanned error code will throw a check engine light
12-15-2022, 10:52 AM
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Right, but the check engine light should turn on when cycling the ignition, which its not in my case!
LightYear1
10-28-2023, 12:29 PM
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Původně odeslal LightYear1
Right, but the check engine light should turn on when cycling the ignition, which its not in my case!
Did you ever figure out? I have the exact same issue, no CEL when switching ignition and there’s an intermittent O2 sensor code (P0154) in ECU which I believe it should turn the CEL on. I pulled the cluster and looks like it wasn’t ever messed with, and the bolts were very tight too.
10-30-2023, 05:30 AM
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Původně odeslal insus100
Did you ever figure out? I have the exact same issue, no CEL when switching ignition and there’s an intermittent O2 sensor code (P0154) in ECU which I believe it should turn the CEL on. I pulled the cluster and looks like it wasn’t ever messed with, and the bolts were very tight too.
There is no fuse. either the bulb in the cluster is bad, or the ECU is not sending a signal to the bulb, or the wiring between the two is bad.
Fixing it might be cheap or it might be expensive, depending on the cause. If your local government mandates that it works, then you have no choice but to diagnose and fix it.
georgeb944
10-30-2023, 05:41 AM
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Původně odeslal georgeb944
There is no fuse. either the bulb in the cluster is bad, or the ECU is not sending a signal to the bulb, or the wiring between the two is bad.
Fixing it might be cheap or it might be expensive, depending on the cause. If your local government mandates that it works, then you have no choice but to diagnose and fix it.
The LED is good, it just doesn’t turn on (I tested it with a multimeter). I connected VCDS and ECU is communicating with the cluster according to a measure value. I tried to do instrument cluster output tests in VCDS, and it does the needle sweep, gong sound and segmentation tests for displays, but the last test, which I believe is the cluster lighting test, it says «ERROR function not available». My cluster is the one with analog clock from 1998. Maybe it’s just the way it works. Last time it passed inspection with the O2 sensor code, I did delete it just before the inspection tho. But it eventually pops up again in the ECU. No CEL.
