Having problems with your 2003 Cadillac Seville STS ?

Fix for 0170 & 0174 System to lean codes

\015 2003 Cadillac STS codes 0170 and 0174, I have already replaced the plenum and plenum gasket as well as the intake gaskets, after 150 miles the codes came back and the car is running rough and first start of the day is hard, I don't know what to look at next\015 Posted / edited by AnonymousUser on : 09-12-2019

Answers :

Well code 170 is for bank one and 174 is for bank two which you probably already know. The computer can not make the mixture rich enough to make the O2 sensors switch to rich.
Have you checked base fuel pressure and watched the data stream coming from the O2 sensors ? Very seldom do two sensors fail at the same time, but it could be something else like the mass air flow meter.
Repair Help & Product Troubleshooting for 2003 Cadillac Seville STS

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