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Old 05-12-2016, 09:58 AM   #1
goob
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Default Error code P2A01

I got a check engine light, code is P2A01, a couple weeks ago, it went out the next day, yesterday it came back.

Which O2 sensor is this one? The one before or after the cat?
Anyone have any recommendations on how to diagnose this?
I'm using torque lite, the front o2 voltage has rapid voltage swings, which i believe is good. The second o2 voltage is pretty steady when car is warmed up, which I believe is supposedly also good. Didn't get to check before it warmed up.

Gary

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Old 05-12-2016, 05:34 PM   #2
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Default Re: Error code P2A01

Hi Goob - how are you?

Here are some tips to get you started:

P2A00 HO2S Circuit Closed Loop (CL) Performance Bank 1 Sensor 1 (PCM)
P2A01 HO2S Circuit Closed Loop (CL) Performance Bank 1 Sensor 2 (PCM)

http://forum.opel-club.ru/index.php?...=post&id=75885

I think Sensor 2 is downstream, behind the cat

http://www.astraownersclub.com/vb/sh...ensor-location
http://www.aa1car.com/library/oxygen..._locations.htm

You might try look online for cleaning instructions rather than replacement. You may also be able to swap the front & rear sensors to confirm that the rear 02 sensor failed. I think the purpose of that (edit-REAR) sensor is only to show cat is working...

Last edited by AstraFasta; 05-12-2016 at 05:42 PM..

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Old 05-13-2016, 11:15 AM   #3
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Default Re: Error code P2A01

Thanks AstraFasta for the info!

Here's a great article that explains what O2 sensors do.

http://www.aa1car.com/library/o2sensor.htm

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Old 05-16-2016, 12:50 PM   #4
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2009 Astra XR
2008 Astra XE
Default Re: Error code P2A01

I had the same code for almost two years and just kept driving. The only time you'll some changes in performance is when the car is really cold. I finally replaced them both when I modified my exhaust and having to go get an E-test. The 2 O2 sensors are not interchangeable in our cars

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Old 05-16-2016, 12:52 PM   #5
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Default Re: Error code P2A01

Interesting. I read that the 02 sensors are interchangeable on the Euro versions. But the Euros have different emissions systems (except in the case of VW hehehe).

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Old 05-31-2016, 02:28 PM   #6
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Default Re: Error code P2A01

Just wanted to let ppl know that I replaced the downstream o2 sensor over the weekend and the check engine light went out today. Car is back to normal. It took two applications (one overnight) of WD-40 and an offset o2 sensor wrench that i bought off of Amazon to remove it. Prior to replacing it, I had codes P2A01, P0141, P2096 and C1555. I originally only had the P2A01 code and didn't notice any driveability issues, but then I started noticing a jerking motion everytime I took my foot off the gas. That is when the other codes appeared.

Thanks for the info and help AstraFasta!

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Old 05-31-2016, 03:32 PM   #7
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Default Re: Error code P2A01

Glad the codes are cleared.

Oddly I have read that the chassis code C1555 can be triggered by a huge variety of problems, including the downstream O2 sensor. For the consumer code scanner, it does not seem to be a particularly helpful code.

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