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lean codes po171 and po174
i need help. have this truck in the shop. po171 lean bank 1, po174 lean bank 2. also has p1133 ho2s b1-s1 insufficient switching and p1153 ho2s b2-s1 insufficient switching. another tech has replaced the o2 sensors and mass airflow sensor and fuel pump. the t... Login to read more. 
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18 Replies Received
| Engine | 5.3 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2001 GMC Yukon SLE 5.3L
| Engine | 5.3 L |
| Trans | 4-speed Automatic (Electronic) |
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