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New rear O2 sensor almost fixes P0422

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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matthew1
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Year and Model: 850 T5, 1997
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New rear O2 sensor almost fixes P0422

Post by matthew1 »

The drive cycle to illuminate the CE light went from 40-140 miles to 240-260 miles. Driving routes have not changed.

Strange. Any ideas?

108k miles '97 850 T-5.
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1998 V70, no dash lights on

1997 850 T5 [gone] w/ MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace

2004 V70 R [gone]

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D_V_ENT850R
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Joined: 3 August 2011
Year and Model: 850R 1996
Location: SWFL

Post by D_V_ENT850R »

Any mods? Factory sensor or aftermarket?? Any of those things would help us understand the issue at hand!

Matty Moo
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Post by Matty Moo »

I don't have a cat on my car.

In warm weather I can go up to 300 miles before triggering a CEL. The other day I triggered it in 30 miles and it was cold.
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1996 850 Platinum Wagon. ARD Green Tune, OBX.-Gone
1998 s70 ARD tune, EST exhaust, SE/R interior.
1999 s70 Plain Jane.
2000 s70 GLT
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matthew1
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Joined: 14 September 2002
Year and Model: 850 T5, 1997
Location: Denver, Colorado, US
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Post by matthew1 »

DV - just the mods listed in my signature. And a DIY cold air intake.

It's been going on for months, always between 40 and 140 miles I'd get my little CE friend, like clockwork. And like clockwork, I'd erase it with my Autel MaxiScan.

After the rear O2 sensor, one distance was 240 miles and the other 250 miles.

Before the rear sensor, I tried Seafoam in tank and through intake, and cleaning the MAF.

Two weeks ago I added an IPD boost gauge.
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Also -> Amazon link
. Click that when you go to buy something on Amazon and MVS gets a cut!

1998 V70, no dash lights on

1997 850 T5 [gone] w/ MSD ignition coil, Hallman manual boost controller, injectors, R bumper, OMP strut brace

2004 V70 R [gone]

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