Help P2A00 code.
#1
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P2A00 code.
Hows it going, I am in need of some help. So my 09 G37 Coupe got a P2A00 code, Bank 1 Sensor 1 o2 sensor code. I changed the sensor and the code popped right back up again. Is there anything else that could be causing that code the come up again? I've read somewhere that it could also be a bad CAT that can cause that code to come up. Thanks for the help and feedback in advance.
#3
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I had a P2A03 code which is the pre-cat sensor similar to P2A00 (can't remember which side is which) but you need to check the cat for tiny cracks and ensure the cats are installed/sealed properly against the header/mid-pipe. Replacing your O2 sensor post-cat won't help
Unfortunately this is one of those PITA generic codes to work with but a close inspection is a good start.
A bad cat would cause the post-cat sensors to go off (and trigger a different code) so it SHOULDN'T be your cat
Unfortunately this is one of those PITA generic codes to work with but a close inspection is a good start.
A bad cat would cause the post-cat sensors to go off (and trigger a different code) so it SHOULDN'T be your cat
#4
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I had p2a03 and had a exhaust leak on my aftermarket fast-intentions high flow cats. They are non-resonated versions. The weld cracked so I had it re-welded. P2a03 is driver's side.
#5
P2A00 is defined as:
• The output voltage computed by ECM from the A/F sensor 1 signal is shifts to the lean side for a specified period.
I think some of the cheaper scanners do a poor job with the correct trouble code definitions.
The factory shop manual is the best place to find out the code description.
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Baadnewsburr (01-29-2019)
#6
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I don't think the definition of the code is very generic:
P2A00 is defined as:
• The output voltage computed by ECM from the A/F sensor 1 signal is shifts to the lean side for a specified period.
I think some of the cheaper scanners do a poor job with the correct trouble code definitions.
The factory shop manual is the best place to find out the code description.
P2A00 is defined as:
• The output voltage computed by ECM from the A/F sensor 1 signal is shifts to the lean side for a specified period.
I think some of the cheaper scanners do a poor job with the correct trouble code definitions.
The factory shop manual is the best place to find out the code description.
#7
• I would look at the total fuel trim (short term + long term) for each bank. They should be fairly close to each other.
• Then I would look at the mass air flow for bank 1 and bank 2. They should also be fairly close.
• Then data log the air/fuel ratio (lambda) for bank 1 and 2 and see how different they are. Again, they should be close.
• I would also data log/graph the rear O2 (narrow band sensor) and see what it is doing.
Here is a nice short video on how the rear O2 sensors works on a G37 or 370z:
The main goal is to figure out is the MAF inaccurate (due to it being dirty) -OR- is the front air/fuel sensor inaccurate (lean bias) -OR- is there an exhaust leak that is allowing in air (O2) into the exhaust and the Air/fuel ratio sensor is just reporting what it sees.
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Baadnewsburr (01-30-2019)
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