P1504 and P1507 indicates problems with the Idle Air Controller valve. The Ford manual suggests to check the resistance across the two terminals on it. The IAC valve is under the plastic engine cover.
engine codes what do 2001 ford mustang engine codes 1504 and 1507 mean? P1504 Idle air control circuit malfunction P1507 Idle air control underspeed error
...P1504, P1507 and P1131 DTC Description Possible Causes Diagnostic Aides P1504 - Idle Air Control (IAC) Circuit Malfunction This DTC is set when the PCM detects an electrical load failure on the IAC ...
...P1504 OR P1507: CHECK FOR INLET AIR LEAKS (OR STARTS ONLY AT PART THROTTLE) This is just some simple common clues, we all do a tuneup first.like:
spark ,filters , belts. , fluids.
and IAC ...
...P1504 V' CLE SPD SNR FLT( CAN COMMERR) P1505 KICK DOWN SWITCH P1506 MPS P1507 MPS - RANGE / PERFORMANCE MAL P1508 MPS - SIGNAL LOW P1509 MPS - SIGNAL HIGH P1510 ISC V/V CIRCUIT MAL P1511 IDLE ...
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