P0171 indicates system lean (bank 1). P0134 indicates no activity from sensor 1 on bank 1. You could have a bad O2 sensor or an actual lean condition. Possible causes of a lean condition include a restricted fuel filter on a vacuum leak.
SOURCE: engine code p0133, p0134, p1133,
All those codes and such an easy fix. ALL of these codes point to your upstream 02 sensor. It's the one on the passenger side of the engine coming off the exhaust, very very easy to get to. Soak that puppy with PB Blaster then remove the electrical connector and remove and replace sensor. TRY to stay away from Bosch 02 sensors, have been known and reported problems with these. In my case, I didn't have a choice but to buy the Bosch, but I haven't had any problems with mine.
Hope this helps, look to get a tad more miles per gallon too.
Testimonial: "Good answer and really appreciate the help. Also was told a PCM recalibration may be needed. Thanks"
SOURCE: trouble code p0134 and p0171
A code P0134 may mean that one or more of the following has happened:
Possible Solutions
The most common fix is to replace the oxygen sensor. But that doesn't rule out the possibility of:
A code P0171 may mean that one or more of the following has happened:
Possible Solutions
Possible solutions include:downstream of the MAF sensor.
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