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Mercedes GL320 CDI 2007 - P1101 Code Explanation and Diagnosis: Is It MAF or Ambient Air Temperature Sensor?

Model: Mercedes Fault Code: P1101 Posted: 2013-02-14 11:31

I'm looking for clarification on the meaning of fault code P1101 in a 2007 Mercedes-Benz GL320 CDI. Despite searching online, I can't find a clear explanation for this specific code. I suspect that manufacturers may reassign or modify P1XXX codes over time, which could explain inconsistencies in documentation. Initially, I considered the Mass Air Flow (MAF) sensor due to erratic readings detected through my OBDII software. However, replacing the MAF resolved those anomalies while the P1101 code persists and appears at every engine startup. The official description for P1101 lists it as 'Ambient Air Temperature Display Temperature Sensor,' but I don't observe any issues with the ambient air temperature display in my vehicle. Additionally, OBDII data shows normal values for both ambient air temperature and Intake Air Temperature (IAT). The code's value of 101 also led me to suspect a MAF-related issue, yet MAF readings appear consistent and behave as expected during driving. I subscribed to the MB StartekInfo service temporarily to verify if P1101 was recognized for my engine model — it wasn't listed as a valid code. I've tested two different OBDII scanners, both of which show P1101, suggesting it's not a device-specific issue. My next step is to visit a Mercedes-Benz dealership, though the hourly rate for basic code reading seems excessive given how straightforward this task should be. I’ve owned vehicles from multiple US and European brands and have never encountered such poor availability of diagnostic information or technical support documentation.

Related fault codes
P1101
Comments (5)
Anonymous 2013-02-14 11:51

Mercedes-Benz P1101 refers to the Ambient Air Temperature Display Temperature Sensor. Does this code correlate with any noticeable symptoms in your vehicle? Note: A fault code does not always indicate a component replacement is needed.

Anonymous 2013-02-15 08:58

Thanks for sharing — I've seen this description listed across several forums, but it's applied to multiple codes, which raises concerns about accuracy. Since I don't observe any issues with the ambient air temperature display, I suspect this might be a misleading or generic description. I'll review all temperature sensor values in my OBDII data to see if anything appears abnormal. Appreciate the insight!

Anonymous 2013-02-23 09:43

The issue doesn't appear to be related to temperature sensors — ambient and intake air temperatures are within expected ranges. While P1101 initially seemed MAF-related, MAF readings remain stable and vary appropriately during driving conditions. I checked the MB StartekInfo service for my engine model, but P1101 wasn’t listed as a valid code. Two different OBDII scanners confirm the same P1101 reading, so it's likely not a scanner limitation. My next step is to visit a Mercedes-Benz dealer — though their hourly rate for basic diagnostics feels unreasonable. These vehicles are built well, but support and diagnostic resources for DIY owners remain extremely limited.

Anonymous 2013-02-23 11:10

If you find the dealership's hourly rates too high, don't go to a doctor — that’s just an analogy! Consider checking scanner compatibility with Mercedes-Benz systems. Many auto parts store scanners only support generic codes (P0000–P0999), and they're often not fully compatible with OEM-specific codes like P1101. It's worth verifying the scanner's MB compatibility before relying on it.

Anonymous 2013-02-27 08:11

Thanks for all the helpful input! The local auto parts store scanner also reads P1101, confirming consistency across devices. I'm planning to visit a Mercedes-Benz dealership next unless someone has alternative troubleshooting suggestions or deeper technical insights.