When testing airbag sensors with a multimetre are they suppose to show open or closed circuit if they are in good condition.

Your best bet would be to take to a qualified repair shop an have diagnostic's done . There are a number of sensors that could cause this . Hooking up a professional type scan tool that can view engine sensor data parameters . Rather then guessing an replacing parts the vehicle doesn't need . Looking at fuel trims , short an long term fuel trims , looking to see if vehicle is in open or closed loop fuel control , are the O2 sensors switching normally . What is the mass air flow sensor data showing , engine coolant temp .Throttle position sensor .
002 Fuel System Tests Start Here

003 Fuel System Tests Scan Data Tests

Ford Airbag Fault Codes
Flash Code Component/Fault Description
- No Air Bag Indicator - Inoperative Indicator Circuit
- Continuous Air Bag Indicator - Diagnostic Trouble Code Timed Out, Diagnostic Monitor
Disconnected or Inoperative, or No Ignition Voltage to Diagnostic Monitor
12 Lost Battery Feed
13 Air Bag Circuit Shorted to Ground
14 Primary Crash Sensor Circuit Shorted to Ground
21 Diagnostic Monitor Not Mounted to Vehicle Properly
22 Safing Sensor Output Circuit Shorted to Battery Voltage
23 Memory Clear Circuit Improperly Grounded
24 System Disarm Failure or Internal Diagnostic Monitor Fault
32 Driver Side Air Bag Circuit High Resistance or Open
33 Passenger Side Air Bag Circuit High Resistance or Open
34 Driver Side Air Bag Circuit Low Resistance or Shorted
35 Passenger Side Air Bag Circuit Low Resistance or Shorted
41 Right Radiator Primary Crash Sensor Feed/Return Circuit Open
42 Left Radiator Primary Crash Sensor Feed/Return Circuit Open
44 Right Radiator Crash Sensor Not Mounted to Vehicle Properly
45 Left Radiator Crash Sensor Not Mounted to Vehicle Properly
51 Airbag diagnostic Monitor Internal thermal fuse Blown
52 Back-up Power supply Voltage Boost Fault
53 Front Crash Sensor High Resistance or Diagnostic Monitor Failure

did you google(using toyota directives>?)

Air bags bad.
get the FSM and read every word and the extreme dangers messing here.
no year stated
no model car. no car actually stated? wow.
no country. SSDD.
ok go to alldata.com and read.
or buy the FSM.
Squib is the explosive device, is faulting.
a squib means a low power explosive.
used in big guns to test fire , or clear a barrel or for parades ,etc.
name was stolen to car industry.
in Viet Nam we called it a short round ( it was , short)
in the car they are shot gun load sizes, and are to be respected at all times. killed many a would be mechanic.

the bad reads open circuit , or the wire is cut or the connector bad
or the bag is SHOT.
random toy , i guessed for you .
http://library.worldtracker.org/Car%20Manuals/Toyota%20Echo%202000-2002%20Approved/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/02echorm/di/rs/cib01065.pdf


FSM , DTC index list
Trouble Code Conditions:
* Open circuit in P squib wire harness or P- wire harness of squib * P squib malfunction * Airbag sensor assembly malfunction
Possible Causes:

• *Front passenger airbag assembly (P squib)
• * Airbag sensor assembly
• * Wire harness

tread lightly fooling with air bags or BOOM.

A mechanic would test the EGR valve and the control motor for operation. The PCM applies power to the control motor to open and close the valve.

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

look 214 is not a valid code for a 1995 escort, this is an OBD1 system. here is a list of trouble codes for this year of ford no matter the model.

You should find the diagnostic connector under your hood normally by the fender on the battery side. By just using your test light and a jumper wire, it will tell you what kind of problem you got.

KEY ON ENGINE OFF (KOEO) TEST
Model years 1984-1995 all models of Ford
1. Make sure engine is fully warmed. If in doubt, run engine at 2000 rpm for 2 minutes.
2. Turn ignition off and wait 10 seconds for system to shut off. Make sure A/C is off and transmission is in Park (automatic) or Neutral (manual).
3. Hook up light and jumper (or a tester if you have one). Turn key to ON (do not start engine). Read the codes.

How to do it?

Example code 23: your test light should flash 2 long consecutive flashes followed by 3 short pulses.

Ford's common codes for OBD1 (vehicles made before 1995)

11 system pass
12 idle control fault
13 dc motor did not move
14 engine rpm signal fault or PIP circuit failure
15 eec processor or power to KAM interrupted
16 rpm to low to check oxygen sensor test or fuel control error
17 cfi fuel control system fault or rich/lean condition indicated
18 ignition diagnostic monitor (IDM) circuit failure
19 cylinder identification (CID) sensor input failure
21 engine coolant temperature (ECT) out of self-test range
22 manifold absolute pressure (MAP) sensor circuit out of range
23 throttle positioner sensor out of self-test range
24 air charge temperature (ACT) sensor out of self-test range
25 knock not sensed during dynamic response test
26 transmission fluid temperature out of self-test range
28 loss of primary tach, right side
29 insufficient input from vehicle speed sensor
31 egr positioner sensor below minimum voltage
32 egr positioner sensor below closed limit
33 throttle positioner sensor noisy/harsh on line
34 egr valve circuit out of self-test range
35 egr valve circuit above maximum voltage
38 idle track switch circuit open
39 axod torque converter or bypass clutch not applying properly
41 oxygen sensor circuit indicates system always lean
42 oxygen sensor circuit indicates system always rich
43 oxygen sensor out of self-test range
44 air injection control system failure
45 coil 1 primary circuit failure
46 coil primary circuit failure
47 4X4 switch is closed or oxygen sensor failure
48 coil primary circuit failure
49 electronic transmission shift error
51 engine coolant temperature sensor circuit open
52 power steering pressure switch circuit open
53 throttle position circuit above maximum voltage
54 air charge temperature circuit open
55 key power input to processor open circuit
56 mass air flow circuit above maximum voltage
57 axod circuit failure
58 idle tracking switch circuit fault
59 automatic transmission shift error
61 engine coolant temperature circuit grounded
62 converter clutch error
63 throttle positioner circuit below minimum voltage
64 air charge temperature circuit grounded
65 charging system over voltage
66 mass air flow sensor circuit below minimum voltage
67 neutral/drive switch circuit open
68 transmission fluid temperature over temperature range
69 transmission shift error
70 data circuit communication link circuit failure
71 message center circuit circuit failure
72 insufficient manifold absolute pressure (MAP) change during dynamic response test
73 insufficient throttle positioner (TPS) change during dynamic response test
74 brake on/off (BOO) circuit open
75 brake on/off (BOO) circuit closed
76 insufficient air flow output change during test
77 brief wide open throttle not sensed during test
78 power interrupt detected
79 a/c on/defrost on during self test
81 map has not changed normally
82 super charger bypass circuit failure
83 OIC-low speed fuel pump relay circuit failure
84 egr vacuum regulator (EVR) circuit failure
85 canister purge circuit failure
86 shift solenoid circuit failure
87 fuel pump circuit failure
88 electro drive fan circuit failure
89 transmission solenoid circuit failure
91 no oxygen sensor switching detected
92 shift solenoid circuit failure
93 throttle positioner sensor input low
94 torque converter clutch solenoid circuit failure
95 fuel pump secondary circuit failure
96 fuel pump secondary circuit failure
97 transmission indicator circuit failure
98 electronic pressure control circuit failure
99 eec has not learned to control idle

u may have an intake manifold leak or low cylynder pressure

Looked up your OBD II code for your Explorer and got the following: Bank 1 Sensor 1
The possible causes are listed below per Chilton: *same result for all engines available on your vehicle

Trouble Code: P0141 (4.0L V6 VIN E Auto)
HO2S-11 Heater Circuit (Bank 1, Sensor 1) Print this code data
Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
During testing the heated oxygen sensor (HO2S) heaters are checked for open and short circuits and excessive current draw. The test fails when the current draw exceeds a calibrated limit or an open or short circuit is detected.
Possible Causes:

• Vacuum hose disconnected on exhaust gas recirculation (EGR) system module (ESM) applications* Short to VPWR in the harness or HO2S
  
• Water in the harness connector
  
• Open VPWR circuit
  
• Open GND circuit
  
• Low battery voltage
  
• Corrosion or incorrec
  

The sensors themselves appear in the illustration linked to below. The illustration is for the Ford Ranger but indications are that other models have similar locations. Hope this helps with your problem. Best of luck!
Greg

http://www.chiltonlibrary.com/content/images/8968/images/89684g23.pdf

Seems to be a very common problem with Ford. The wiring harness beneath the drivers seat contains the sensors for the airbag system. Go under the drivers seat and secure all the wires and clips. This makes most error lights for the airbags go away. Hope this helps and good luck!

P0176 - Flexible Fuel (FF) Sensor Circuit Malfunction
"The FF sensor input signal to PCM is continuously monitored. The test fails when the signal falls out of a maximum or minimum calibrated range."

This sometimes requires replacement of the FF sensor which is part of a larger assembly. It is very expensive ($400?). Before throwing any parts at it, I would run some more fuel through it and reset the PCM by disconnecting the negative battery cable for a minute or two.

Here is the complete list of possible causes from Ford:

-Open or short in FF sensor VPWR circuit
-Open in battery ground to FF sensor circuit
-Open in FF sensor signal circuit
-Short to ground in FF sensor signal circuit
-Fuel contamination
-Short to VPWR in FF sensor battery ground circuit
-Short to VPWR in FF sensor signal circuit
-Fuel separation
-Damaged FF sensor
-Damaged PCM