Please help: A5 2010 3.2 v6 getting P21A0
01-22-2019, 10:31 AM
#13
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01-24-2019, 04:45 PM
#14
You need a VAGcom scan to get Audi specific codes but here’s what I found about your generic code. P21A0 Engine Trouble Code - P21A0 OBD-II Diagnostic Powertrain (P) Trouble Code | Engine-Trouble-Code.com Apparently has to do with fuel air mixture. Lots of possibilities there from mass airflow sensor ( does the 3.2 run one?) to vacuum leaks to bad O2 sensors. Your mention of a new K&N air filter makes me suspicious. Over oiled K&N filters can contaminate MAFs. Good luck.
Read up too on the Carista app and Bluetooth scanner. I have that too and hardly ever have to resort to VAGcom.
Read up too on the Carista app and Bluetooth scanner. I have that too and hardly ever have to resort to VAGcom.
01-30-2019, 01:47 PM
#15
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Engine Light On - P21A0
Hey guys, my engine light has been on for a while and the code shows P21A0. At first I cleared code and it came back after few weeks. Now when I clear the code it comes back the next day.
I did some reseach on the code seems like it's an issue with the air/fuel mix ratio.
I tried put in a bottle of fuel injector cleaner into the gas tank and the light was off for a week then came back on again...
Any idea on how to solve this?
Thanks,
I did some reseach on the code seems like it's an issue with the air/fuel mix ratio.
I tried put in a bottle of fuel injector cleaner into the gas tank and the light was off for a week then came back on again...
Any idea on how to solve this?
Thanks,
06-30-2020, 05:20 PM
#17
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Hello
Hey guys, my engine light has been on for a while and the code shows P21A0. At first I cleared code and it came back after few weeks. Now when I clear the code it comes back the next day.
I did some reseach on the code seems like it's an issue with the air/fuel mix ratio.
I tried put in a bottle of fuel injector cleaner into the gas tank and the light was off for a week then came back on again...
Any idea on how to solve this?
Thanks,
I did some reseach on the code seems like it's an issue with the air/fuel mix ratio.
I tried put in a bottle of fuel injector cleaner into the gas tank and the light was off for a week then came back on again...
Any idea on how to solve this?
Thanks,
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