p0172 code on 98 s90
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RickHaleParker
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P0172: System Too Rich (Bank 1)
It means the front oxygen sensor has detected a fuel rich condition in the exhaust.
Common causes
1. Dirty MAF.
2. Fuel pressure
3. Vacuum leak.
Clean MAF with MAF cleaner.
Check Fuel pressure.
Smoke test for Vacuum leaks.
It means the front oxygen sensor has detected a fuel rich condition in the exhaust.
Common causes
1. Dirty MAF.
2. Fuel pressure
3. Vacuum leak.
Clean MAF with MAF cleaner.
Check Fuel pressure.
Smoke test for Vacuum leaks.
Last edited by RickHaleParker on 20 Dec 2017, 19:22, edited 1 time in total.
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1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.