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Re: Malfunction of B1S2 as a Reason DTC P0171
Posted to Technical Discussion Forum on 10/15/2014 5 Replies

Hello David,

I almost agree, but the the parameter O2FT BB1S2 is not changing (always 99.15%)

In addition, the Service Manual (RM784U), TSB and Toyota Tech Tip makes no mention of such a reason code 0171 as the rear (downstream) Oxygen Sensor B1S2 ... Login to read more.

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