Q: Iat sensor

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Mass air flow sensor code appear changed and check 4 wires then faulty ground in fuel pump check and it was faulty replace. Fuel pump . the fuel filter on chassis was replaced end last year. No code for mass air flow code came up but throw intake air temperature sensor and o2 sensor. Check harness and wires were good then replaced iat and both 02 sensors also replaced coolent temp sensor. Reset computer and codes still appear. For iat.

My car has 200000 miles.
My car has a manual transmission.

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