Check engine light on

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Feb 21, 2019 | 08:49 PM
  #1  
About 2 weeks ago, I got a check engine light and vsc, so I decided to head to autozone to see what was going on. Turns out that I got a P0172 System running to rich. I ordered a MAF Sensor (Duralast DL-3000) then took it home and installed it. Everything ran right, shifted better than before, better performance, and idled smoothly. Worked fine for about 300-500miles, then the check engine light and vsc came back on. What’s wrong with the car? I just replaced the MAF Sensor.
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Feb 21, 2019 | 10:21 PM
  #2  
When it comes to sensors, I would only recommend OEM.

Salim
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Feb 21, 2019 | 10:34 PM
  #3  
Quote: When it comes to sensors, I would only recommend OEM.

Salim
Understandable. But this one has a lifetime warranty so I’m not worried. Plus I checked the MAF Sensor to see if it was working properly by unplugging it while the vehicle was running and it stalled, so it was doing its job.
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Feb 22, 2019 | 05:13 AM
  #4  
Working and working within proper parameters are different things. I've learned over the years that MAF's are too complex for aftermarket companies. I'm a tech and see it all the time. I've ordered up to 3 of the same MAFs until I get a good one from the parts stores. Thats more than one occasion. It would not be surprising for one from say Autozone to only last 6 months.
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Feb 22, 2019 | 10:08 AM
  #5  
Okay. But besides this, do you think it might be the O2 Sensor under the driver seat that’s gone bad, since I just replaced the MAF Sensor?
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Feb 22, 2019 | 10:16 AM
  #6  
You didn't say what the new code is
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Feb 22, 2019 | 09:20 PM
  #7  
Get a bluetooth OBD2 reader so you can read your own codes and also see your sensor outputs using a tablet or smartphone app. The CEL may not be the P0172 you had previously.

You need to be able to see your fuel trims to know if it is one of the A/F sensors or the MAF sensor. Both banks could be running rich even though you only got the code for bank1. If both banks are rich, it is likely the MAF, only one bank then the A/F sensor is the likely culprit.
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Feb 22, 2019 | 11:40 PM
  #8  
Quote: Get a bluetooth OBD2 reader so you can read your own codes and also see your sensor outputs using a tablet or smartphone app. The CEL may not be the P0172 you had previously.

You need to be able to see your fuel trims to know if it is one of the A/F sensors or the MAF sensor. Both banks could be running rich even though you only got the code for bank1. If both banks are rich, it is likely the MAF, only one bank then the A/F sensor is the likely culprit.
What Bluetooth OBDII scanner do you recommend off of amazon?
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Feb 23, 2019 | 05:58 AM
  #9  
Quote:
What Bluetooth OBDII scanner do you recommend off of amazon?
I have this one
Amazon Amazon

Use the Torque app with android. There are other apps for iOS but I have no experience with them.
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Feb 23, 2019 | 12:26 PM
  #10  
You want to be able to get live data and also view DTC codes. This is from my Android phone running Torque Pro.

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