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P0422 - Is it a fake code Topic is solved

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xHeart
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P0422 - Is it a fake code

Post by xHeart » Thu Dec 06, 2018 12:21 pm

There aren't many references, not discussed often:
https://www.matthewsvolvosite.com/volvo ... ewer-codes


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Re: P0422 - Is it a fake code

Post by RickHaleParker » Thu Dec 06, 2018 4:57 pm

P0422 = Three-way catalytic converter (TWC) efficiency.

On a 1997 850 with M 4.4, P0422 = EFI-443.

Diagnostic trouble code (DTC) information EFI-443
EFI-443 Three-way catalytic converter (TWC) efficiency

A2301062 Condition
The engine control module (ECM) continuously monitors three-way catalytic converter (TWC) efficiency by comparing the signal from the rear heated oxygen sensor (HO2S) with the signal from the front heated oxygen sensor (HO2S). When three-way catalytic converter (TWC) efficiency deviates too much the engine control module (ECM) stores diagnostic trouble code (DTC) EFI-443.

Substitute value
none.

Possible source
  • uneven compression
    air leakage in the intake system
    air leakage in the exhaust system
    faulty fuel pressure
    defective three-way catalytic converter (TWC).
Fault symptoms
may result in poor performance.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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Re: P0422 - Is it a fake code  Topic is solved

Post by xHeart » Fri Dec 07, 2018 11:08 am

Thank you for the details.
The CEL is on our 2001 V70XC - ME7.

After reading your notes, my VIDA Search for P0422 returned it with corresponding ECM 4801: Permanent Fault.

The instructions for diagnose and check appeared confusing. Example: air leakage in the intake system - It says to remove Fresh Air Intake pipe from MAF and then connect tool xyz (Mityvac) to Fresh Air Intake pipe.

The item #9 is from MAF to turbo?
Image


FWIW - disconnected vac tube from purge valve to intake port . Tested purge valve for vacuum leak. It passed, i.e. closed, holds vacuum.

The vac tube (the tube on right connects to port on purge valve & bottom tube goes to intake):
Image


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Golden Retriever | 2014D VIDA DiCE | 2013A XC90 +140mi/225km | 2001 V70XC 1st Owner +190mi/ +305km | 1997 Volvo 850 NA 1st Owner +180mi/ +289km
Past: German Shepherd | 1989 Volvo 740 GL | 1979 Volvo 240

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Re: P0422 - Is it a fake code

Post by xHeart » Wed Aug 07, 2019 2:18 pm

The code P0422 returns intermittently.
The CEL goes away when ambient is above 90ºF, like today. What sensor to dust-off, clean?

Last month, it passed emission with a gentle reminder from the inspector to have it looked for code P0422.


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Past: German Shepherd | 1989 Volvo 740 GL | 1979 Volvo 240

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Re: P0422 - Is it a fake code

Post by abscate » Thu Aug 08, 2019 3:10 am

Next year it might do the same. That same vacuum line system self destructed on my car a couple years back. You could try a smoke test for induction leaks


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