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Rear O2 sensor code

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70
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dosbricks
Posts: 1116
Joined: 30 December 2004
Year and Model: '96 855, '98 S70
Location: South Texas
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Rear O2 sensor code

Post by dosbricks »

A while back I got a PO422 (cat effiency) code on my wagon :cry:
Heeding the good advice of others on the boards, I waited until it set a code a couple more times. The second and third time it was PO137 (rear O2 sensor). :) I replaced it today and found my former indy had wired in the universal type rather than the OEM one I paid him $175 to get. Probably the cause of the premature failure.

So if you get a 422 wait it out because a faulty rear sensor can kick it. Also, better to get the OEM sensor with the wiring harness.
'98 S70, 230k, purchased new in '98
'96 855 GLT, 163k, purchased lightly used in '99
Onceuponatime RIP '69 Shelby GT500 w/7.0 liter
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