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Old 01-30-2013, 12:09 PM   #1
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Need help diagnosing a P0430 error code

My 01 Boxster ‘S’ Tip (69,000 miles) has started to throw P0430 codes about every 200 miles this winter. I have read from previous postings that “generally” the P0430 indicates the Bank 2 pre-cat is not functioning properly, as determined by the front and rear O2 sensors. My question is it the pre-cat or the O2 sensors, or something else?
With my Durametric reader I collected the following readings after a 10 mile normal drive.
At idle and 180 degrees engine temp……….
BANK 1
Front O2 sensor voltage readings: 0.08 to 0.78 fluctuating (like roller coaster)
resistance reading: 128 steady (flat line)
Rear O2 sensor voltage readings: 0.68 to 0.76 steady (flat line)
resistance reading: 320 steady (flat line)
BANK 2

Front O2 sensor voltage readings: 0.09 to 0.78 fluctuating (like roller coaster)
resistance reading: 64 steady (flat line)
Rear O2 sensor voltage readings: 0.65 to 0.79 steady (flat line)
resistance reading: 192 steady (flat line)

All (4) O2 sensors heater voltage: 2.05 v

Observation: The front and rear O2 voltage readings for both Bank 1 and Bank 2 are almost identical and acting the same. However, the Bank 2 resistance values are approx. 1/2 of the Bank 1 values.
Could this be cause of the P0430 error code…….the O2 sensors rather than the pre-cat???
[no P0420 (Bank 1) codes observed]

ADDITIONAL Durametric reader information…
Ready Status….
Cat Conv Effectiveness …………………………Pass
Fuel Tank Ventilation ……………………………Fail (no explanation)
Secondary Air System …………………………Pass
Oxygen sensors …………………………………Pass
Oxygen sensor heaters …………………………Pass

Would the fuel tank ventilation (fail) have any effect on the P0430 code?
Fuel cap about 2 years old….seal looks good?

Also, MAF cleaned 200 mile ago.
Any and all suggests will be welcomed.

Thanks, Phil
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Old 01-30-2013, 12:25 PM   #2
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I don't know enough to comment on your O2 sensor data, but I do have a clarification question for you on the fuel ventilation reading.

Have you recently used the Durametric tool to clear the fault codes? If so, you may be getting the "fail" status reading simply because the systems haven't cycled enough for the fuel ventilation system to begin monitoring once again. I had cleared all the codes in my 01S and saw a similar fail reading. After driving the car for several more days, the fuel ventilation switched from fail to pass.

Last edited by thom4782; 01-30-2013 at 12:33 PM.
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Old 01-30-2013, 12:37 PM   #3
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Two of the specific diagnostics steps in the decision tree for P0430 are to check the EVAP canister purge valve and the line connecting the EVAP canister purge valve and in intake system, as a problem with either will throw off the TWC conversion on bank 4-6. As you are showing a “fail” for the fuel tank ventilation system, which is the EVAP system, I’d start looking there.
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Old 01-31-2013, 04:38 AM   #4
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thom4782, The Durametric readings were taken only after about 20 miles of driving after the P0430 error code was cleared. I plan on driving the car a few more days and will check Ready Status readings again.

JFP in PA, Would it be possible for you to send me the diagnostic steps in the decision tree for the P0430 code? I believe there are some 'tests' in the Durametric program for the EVAP canister purge. I will have to take another look at that.
Any other suggestions?

Thanks
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