P1121 Ford Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
no they are not related !
Are there any cracks in the rubber hose from air cleaner to throttle body ! That could cause the P1121 air entering after mass air flow sensor !
P1121 - Throttle Position (TP) Sensor Inconsistent with MAF Sensor
The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.
- Air leak between MAF sensor and throttle body
- TP sensor not seated properly
- Damaged TP sensor
- Damaged MAF sensor
Drive vehicle and exercise throttle and TP sensor in all gears. A TP PID (TP V PID) less than 4.82 % (0.24 volt) with a LOAD PID greater than 55% or a TP V PID greater than 49.05% (2.44 volts) with a LOAD PID less than 30% indicates a hard fault.
P0401 - EGR Flow Insufficient Detected
The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
- Vacuum supply
- EGR valve stuck closed
- EGR valve leaks vacuum
- EGR flow path restricted
- EGRVR circuit shorted to PWR
- VREF open to D.P.F. EGR sensor
- D.P.F. EGR sensor downstream hose off or plugged
- EGRVR circuit open to PCM
- VPWR open to EGRVR solenoid
- D.P.F. EGR sensor hoses both off
- D.P.F. EGR sensor hoses reversed
- Damaged EGR orifice tube
- Damaged EGRVR solenoid
- Damaged PCM
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents