1998 Lexus Gs 400 "p0172 p0420 p0340" Questions

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p0172, p0420, and p0340, 3 codes present on my 2002 Envoy. p0172 fuel too rich bank 1, p0420 catalyst efficiency low bank 1, and p0340 camshaft position sensor prob...what first? Track the p0340 first

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...P0172 System too Rich - Bank 1. P0261 Injector Circuit Low - Cyl. 1. P0262 Injector Circuit High - Cyl. 1. P0264 Injector Circuit Low - Cyl. 2. P0265 Injector Circuit High - Cyl. 2. P0267 Injector ...

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...P0172 System Too Rich (Bank #1) P0173 Fuel Trim Malfunction (Bank #2) P0174 System Too Lean (Bank #2) P0175 System Too Rich (Bank #2) P0176 Fuel Composition Sensor Circuit Malfunction P0177 Fuel ...

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