Panamera 4S - code P0421
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Panamera 4S - code P0421
Hi!
Porsche Panamera 4S – 2010 / 70kmiles – 122kkm
The engine light illuminates, and the scanner throws code P0421. When deleting the code I can drive like 300 – 400 km, then the engine light comes again.
When doing “live data” on the scanner, all figures seems normal. Especially the up- and downstream cat. temp. They are equal on both banks on all revs, speeds and loads. And the temp is higher downstream. Which indicates that the cats. work`s and that its not clogged and the exhaust passes without problems.
There are two figures I don’t understand;
- The misfire counter number is constantly increasing, but no misfires is registered on each cylinder. For the specified cylinders, it shows zero misfires. Is it my scanner (Foxwell 70i Pro)?
- The other figure is;
o K020 status of cat-converter bank 1 – 1.882933,
o K030 status of cat-converter bank 2 – 0.000000.
Since this doesn’t throw a code, it seems like 0.0000 is within the limits, but still strange…
Which sensors, or combination of data, results in K020 and K030?
It might be a reduced effect in the bank1 cat, and this might be caused by a period of misfires (I have just bought the car). There are several reasons for misfire. I have changed the sparks, and visually checked the coils. Vacuumleaks is another option, and by the way the exhaust sound system doesn’t work. Where to start to check for vacuum issue(s)? But then again, a vacuum issue would have effect on both bank`s, not just bank1.
Then finally, It could be as simple as the downstream bank1 O2-sensor.
Instead of “inventing the wheel” I appreciate tip`s and experiences before going down the change-parts-road 😉
Porsche Panamera 4S – 2010 / 70kmiles – 122kkm
The engine light illuminates, and the scanner throws code P0421. When deleting the code I can drive like 300 – 400 km, then the engine light comes again.
When doing “live data” on the scanner, all figures seems normal. Especially the up- and downstream cat. temp. They are equal on both banks on all revs, speeds and loads. And the temp is higher downstream. Which indicates that the cats. work`s and that its not clogged and the exhaust passes without problems.
There are two figures I don’t understand;
- The misfire counter number is constantly increasing, but no misfires is registered on each cylinder. For the specified cylinders, it shows zero misfires. Is it my scanner (Foxwell 70i Pro)?
- The other figure is;
o K020 status of cat-converter bank 1 – 1.882933,
o K030 status of cat-converter bank 2 – 0.000000.
Since this doesn’t throw a code, it seems like 0.0000 is within the limits, but still strange…
Which sensors, or combination of data, results in K020 and K030?
It might be a reduced effect in the bank1 cat, and this might be caused by a period of misfires (I have just bought the car). There are several reasons for misfire. I have changed the sparks, and visually checked the coils. Vacuumleaks is another option, and by the way the exhaust sound system doesn’t work. Where to start to check for vacuum issue(s)? But then again, a vacuum issue would have effect on both bank`s, not just bank1.
Then finally, It could be as simple as the downstream bank1 O2-sensor.
Instead of “inventing the wheel” I appreciate tip`s and experiences before going down the change-parts-road 😉
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Joined: Jan 2019
Posts: 8
From: Santa Fe, New Mexico
Rep Power: 0
I have the same car and same code with 88k miles. I feel your pain!
Last year I replaced all coils and spark plugs, no help. Then I replaced bank 1 O2 sensor, no help. Replaced bank 2 O2 sensor last week, no help.
I can try the live data collection on my scanner to compare with yours.
My next step is to replace the catalytic converter.
Last year I replaced all coils and spark plugs, no help. Then I replaced bank 1 O2 sensor, no help. Replaced bank 2 O2 sensor last week, no help.
I can try the live data collection on my scanner to compare with yours.
My next step is to replace the catalytic converter.
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