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94 Ford F-150 5.8L engine error code 538 help?


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Update: this is what i got after running test what does it mean and how do i fix 

error 538 
Insufficient RPM change 
during Dynamic Response 
Test (Engine Run Self- 
Test). 
or, 
Invalid cylinder balance test 
– throttle position 
movement. 
or, 
Invalid cylinder balance test 
– cylinder identification 
problems.

VT55 OBDII is a universal TPMS sensor activator that can also program the vehicle ECU, if required. Compatible with all currently known TPMS sensors, it has a built in synchronization software which ensures that it stays up-to-date with all the new TPMS sensors introduced every year. Designed to last in forceful environments like tire repair shops, the VT55 OBDII can handle high volume testing throughout the day due to its rechargeable battery. The VT55 OBDII is equipped with the latest advanced stream decoding technology that can trigger and decode sensors much faster and more accurately than previous generation devices.

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