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Old 05-17-2019, 08:11 PM   #1
pepega
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Join Date: Dec 2018
Location: Boston
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Year: 2005
Model: 330ci
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P0140 and P0030 need help

Today I got a CEL with the codes

P0140 O2 sensor circuit no activity detected

and

P0030 HO2S Heater Control Circuit

I have searched for more info on these two codes but I have not found any threads with both the codes present.

Does anyone have any ideas on how to solve this? What are some things I should check first before going ahead and buying O2 sensors. All O2 sensors have been replaced a while ago.

Let me know if you need more information. I plugged my bluetooth OBD code reader and got the codes from OBD fusion app.
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Old 05-17-2019, 08:20 PM   #2
Archbid
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https://www.obd-codes.com/p0140

Either you have a bad sensor, a faulty wire, or something wrong with the ECM. I would hook up an app like OBDFusion and see whether bank 1 sensors are reporting. Once you find the bad one, switch to see if the reporting failure follows the sensor. If they are both bad, inspect the wiring.

Just remember to switch back.

And the maintenance interval on your O2 sensors is 125k, so if you are over that, I would replace them in any case to avoid other codes.
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Old 05-19-2019, 09:39 AM   #3
pepega
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What does the code P0030 mean? What is the heater control circuit?
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Old 05-19-2019, 03:08 PM   #4
Archbid
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Quote:
Originally Posted by pepega View Post
What does the code P0030 mean? What is the heater control circuit?
There is a heater inside the O2 sensor, and a circuit that provides power to it. A failure of that circuit could be the sensor is failed, the wires or connectors are compromised, or there is an ECM issue.

Replace the pre-cat O2 sensors. They are due.

The issue with many of these emissions-related codes is that a single cause, like failing O2 sensors, can lead to 10 different codes. Your O2 sensors are almost certainly failing, and when you replace them, these codes will likely go away.

Then I would strongly suggest that you get OBDFusion and look at your fuel trims, as cars at your age and mileage also tend to have vacuum leaks, old fuel filters, and MAF issues. If you can afford it, at 150k I would replace original pre-cats, MAF, fuel pump, fuel filter (really this is a 60k interval), and all rubber - CCV, DISA gasket, vacuum hoses if not replaced already. It runs $600-800, but then you can avoid chasing stuff for the next two years.
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Old 05-19-2019, 03:11 PM   #5
pepega
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Year: 2005
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Transmission: manual
Thanks! I am in the process of doing what you recommended.

Before I got those codes, I had a P2096 and that went away and got replaced by P0030 and P0140. So failing o2 sensors leading to different codes is probably true here.
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