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At this many miles, I am curious whether or not the timing chain could really be the issue or if it is a combination of solenoid/ sensor issues. Everyone I've spoken to about it yells "Timing chain! Timing chain!"

I have had her for a while and have done the routine maintenance since and want to keep her around for a while longer.

Vehicle: 2001 Infiniti QX4 3.5L V6

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P0138 INFINITI - HO2S12 Circuit High Voltage
Read more: https://www.autocodes.com/p0138_infiniti.html

P0139 INFINITI - HO2S12 Slow Response
Read more: https://www.autocodes.com/p0139_infiniti.html

P0158 INFINITI - HO2S22 Circuit High Voltage
Read more: https://www.autocodes.com/p0158_infiniti.html

P0159 INFINITI - HO2S22 Slow Response
Read more: https://www.autocodes.com/p0159_infiniti.html

P1140 INFINITI - Intake Valve Timing Control Performance Bank 1
Read more: https://www.autocodes.com/p1140_infiniti.html

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