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This is a pressure sensor, telling the EFI what the absolute pressure at the manifold is. The sensor statistically is the issue, but so can connections along the circuit....
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There is a small map sensor (MDP) that sits directly on top of your intake manifold. The sensor doesnt' seem to effect the car in any REAL way. I drove for 2 years with that code with no problems. I've just recently picked a used one from a guy who did a 6 bolt swap and the code is now gone. I didn't notice any difference by changing it though.
I think I paid 30 dollars shipped or something. New I believe they go for approximately 95 dollars US. Definately worth finding a used one if you can.
The transmission does not have a fuse, only a power-up relay located in the under hood fuse panel, near the front of the panel.
If there is a problem with this relay, your transmission will reduce to fail safe mode only. Fail safe is the mechanical-only control which leaves you with Park, Reverse and 3rd gear only, provided there are no internal failures.
Are you sure it is not P0140 that is for O2 sensor bank 1 sensor 2, so it it the 1 after the catalytic converter. i have no idea what a p1400 so i am guessing.
p1400- is Your MDP (Manifold Differential Pressure) Sensor is toast. It's not going to
effect your drive ability. It's really only there to make sure your EGR valve is
working properly (it helps display the readiness code for it). these are over $100.00 best bet is to see if you can get one at a local junk yard. good-day! this is for mitsubishi vehicles. you maybe able to find a cheap one on E-bay.
code p1400 is a DPF EGR sensor CIRCUIT LOW VOLTAGE detected. most likely is a problem with the wiring to the egr or dpfe sensor. the pinpoint tests for code p1400 instruct you to test all wiring before replaceing the egr or dpfe sensor
The DPFE sensor is usually not hard to
change. There are 2 small rubber hoses that run from the EGR tube to it...
Replace DPFE sensor, reset engine fault codes. The Ford one is a good one and rockauto.com
carries Airtex. Sometimes I hear that this change always need replace EGR valve to delet all codes. Test it.
In order to give you accurate information. I need size of engine example 2.0 L 3.0L. but code P1400 means Differential Pressure feedback EGR circuit low input. Maybe your differential oil is low.
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