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Code P0172 on '96 850

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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WaltS
Posts: 2
Joined: 31 March 2003
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Code P0172 on '96 850

Post by WaltS »

Car runs fine inspite of code. No Symptoms relating to code. What is the downside of ignoring since there are many things that could cause this?
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MadeInJapan
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Posts: 13434
Joined: 31 March 2005
Year and Model: '98 S70 T5 '07S40T5
Location: Knoxville, TN American but born in Japan
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Post by MadeInJapan »

This is the code for "system too rich (bank 1)." This means that most likely your front 02 sensor is going out or is bad. You should not ignore it. If you do you could damage your catalytic converter which would be big, big, let me repeat, BIG bucks to replace. If you live in a state with emissions testing, it will also not pass them. Buy a new 02 sensor from www.fcpgroton.com with the harness attached (not the one you have to splice in) and it's an easy repair. Good luck!
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
'07 S60 2.5T Blue/Taupe- my kid's Volvo
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