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Error codes 0171 and 0172 at once

 
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Old 10 Apr 2019, 10:40 pm
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Default Error codes 0171 and 0172 at once

Hi guys,
I have now two errors - 0171 and 0172 at once - engine running lean and rich at once. No other problems noticed. I thought, O2 sensors are faulty, but the readings seems to be ok. What could it be?
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Old 11 Apr 2019, 12:17 pm
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Default Re: Error codes 0171 and 0172 at once

My first thought for both codes at once would be the throttle position sensor (TPS).

There are some diagnostics in the service manual for your PT. 2004 GT, right?. Here's a link where you can download the service manual from my Google Drive:

https://drive.google.com/file/d/0B9C...ew?usp=sharing
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Old 11 Apr 2019, 07:28 pm
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Default Re: Error codes 0171 and 0172 at once

What year is your Pt Cruiser?

If it has the egr valve you might want to check it out.

If it does not have the egr valve it might be air leaking in from your intake through a gasket or hose. Check for vacuum leaks.
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Old 11 Apr 2019, 09:19 pm
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Default Re: Error codes 0171 and 0172 at once

Have you tried resetting the codes?
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Old 11 Apr 2019, 09:46 pm
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Default Re: Error codes 0171 and 0172 at once

Thanks. Yes, I have deleted the codes, but they are back
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Old 11 Apr 2019, 09:58 pm
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Default Re: Error codes 0171 and 0172 at once

Do you have a vacuum guage?
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