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Volvo S70: Code P0171 and White Smoke

Let’s talk Code P0171

On startup, regardless of the weather, the S70 will let out a puff of white smoke. The Check Engine light is on and throwing a P0171 code. O2 sensors have been replaced and the code continues to pop up. I noticed today while sitting at the store idling that it would idle at 900 rpm’s. Every once in a while the engine would “stutter” and drop to 800 to 700 rpm’s for a second. I would really appreciate any help.

98 S70 GLT P0171 and White Smoke

Bonus! More on the Volvo S70

Introduced in Europe in late 1996 for the 1997 model year and later in the U.S. for the 1998 model year, the Volvo S70 was an updated version of the Volvo 850 saloon. The S70’s body style was overall more rounded compared to its predecessor. Changes included a redesigned front end with new lights, fully colour-coded bumpers and side trim, and clear indicator lenses for the rear lights, as well as a redesigned interior. According to Volvo, a total of 1800 changes were made

Standard equipment was improved with remote central locking, heated & electrically adjustable mirrors, 4 airbags, power brakes with ABS and power windows being standard on every car. Trim levels varied for each market as did the equipment levels of the most basic trims. In the United States, the badging denoted the engine variant and to some extent the equipment level, whereas in Europe engine and options could be chosen individually. On all markets more powerful versions usually received better or upgraded standard equipment. The T5 and R were the series high-performance models.

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