i bought a 2011 Cruze with a bad head gasket a few months ago. Head Gasket is fixed and I installed the V3 PCV fix. The PCV valve was gone. Car has 140k miles. Codes can be cleared with scanner but they seem to come right back after driving 10-15 miles. Any suggestions on what to look at next? Replace Map sensor?
2011 Cruze W P0102, P0420, and P0171
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Vectra C SW Elegance II, Z18XER, '07; Astra F SW Sport, X16XEL, '95; Astra F CC Euro 96, X16XEL, '96
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P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency. Use this: Search results for query: P0102 .
P0171 Fuel Trim System Lean Bank 1. Use this: Search results for query: p0171 .
P0420 Catalyst System Low Efficiency. Use this: P0420 Code - Step-by-Step Diagnostic Procedure .
P0171 Fuel Trim System Lean Bank 1. Use this: Search results for query: p0171 .
P0420 Catalyst System Low Efficiency. Use this: P0420 Code - Step-by-Step Diagnostic Procedure .
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I have some of the same codes appearing on my 2014. I need to replace my pcv valve soon but I think my mass flow sensor has an issue. From reading it sound like GM combined the sensor with a temperature sensor. The mass A flow sensor is reliable but I think the temperature side is not so reliable. Scan tool states it has a higher chance of going bad, look at the iat - intake temps on scan tool if it is not correct that could be the issue.
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