I am getting error code P0203 on my 2000 Hyundai Sonata, V6. This indicates #3 Fuel injector open circuit. Have replaced fuel injector and continuity of wiring is strong. I am stumped as I continue to get same error message after repair. Stumped in Missouri. HELP!!

P0300 is Random Misfire. 01, 03 and 05 narrows it down to those cylinders.

Clean throttle body and MAF, you may have carbon flaking off and fouling plugs. You could try taking it for a good thrash down the highway for an hour.

Car error codes::


Diagnostic Trouble Code Storage Condition Remedy
P0100 Mass Air Flow Sensor Voltage High C-8
P0100 Mass Air Flow Sensor Voltage Low C-8
P0110 Intake Air Temperature Voltage High C-10
P0110 Intake Air Temperature Voltage Low C-10
P0115 Coolant Temperature Voltage High C-9
P0115 Coolant Temperature Voltage Low C-9
P0120 Throttle Position Sensor (TPS) Voltage High C-7
P0120 Throttle Position Sensor (TPS) Voltage Low C-7
P0130 O2 Sensor 1 Circuit Voltage High C-30
P0130 O2 Sensor 1 Circuit Voltage Low C-30
P0130 O2 Sensor 1 Open Circuit C-30
P0150 O2 Sensor 2 Circuit Voltage High C-31
P0150 O2 Sensor 2 Circuit Voltage Low C-31
P0150 O2 Sensor 2 Open Circuit C-31
P0201 Injector Valve 1 Voltage High C-20
P0201 Injector Valve 1 Voltage Low C-20
P0201 Injector Valve 1 Open Circuit C-20
P0202 Injector Valve 2 Voltage High C-21
P0202 Injector Valve 2 Voltage Low C-21
P0202 Injector Valve 2 Open Circuit C-21
P0203 Injector Valve 3 Voltage High C-22
P0203 Injector Valve 3 Voltage Low C-22
P0203 Injector Valve 3 Open Circuit C-22
P0204 Injector Valve 4 Voltage High C-23
P0204 Injector Valve 4 Voltage Low C-23
P0204 Injector Valve 4 Open Circuit C-23
P0205 Injector Valve 5 Voltage High C-24
P0205 Injector Valve 5 Voltage Low C-24
P0205 Injector Valve 5 Open Circuit C-24
P0206 Injector Valve 6 Voltage High C-25
P0206 Injector Valve 6 Voltage Low C-25
P0206 Injector Valve 6 Open Circuit C-25
P0230 Fuel Pump Relay Voltage High C-6
P0230 Fuel Pump Relay Voltage Low C-6
P0230 Fuel Pump Relay Open Circuit C-6
P0325 Knock Signal Circuit 1 C-26
P0330 Knock Signal Circuit 2 C-26
P0335 No Engine RPM Signal C-32
P0335 Incorrect RPM Signal C-32
P0340 Hall Sensor Voltage High C-15
P0340 Hall Sensor Voltage Low C-15
P0403 EGR Valve Voltage High C-28
P0403 EGR Valve Voltage Low C-28
P0403 EGR Valve Open Circuit C-28
P0410 Secondary Air Pump Voltage High C-27
P0410 Secondary Air Pump Voltage Low C-27
P0443 Fuel Tank Ventilation Valve Voltage High C-29
P0443 Fuel Tank Ventilation Valve Voltage Low C-29
P0443 Fuel Tank Ventilation Open Circuit C-29
P0500 Vehicle Speed Signal C-42
P0505 Idle Air Control Voltage High C-33
P0505 Idle Air Control Voltage Low C-33
P0550 Power Steering Voltage High C-14
P0550 Power Steering Voltage Low C-14
P0560 Battery Voltage High C-4
P0560 Battery Voltage Low C-4
P0602 Control Module Programming Error C-2
P1110 Intake Manifold Valve 1 Voltage High C-34
P1110 Intake Manifold Valve 1 Voltage Low C-34
P1111 Intake Manifold Valve 2 Voltage High C-35
P1111 Intake Manifold Valve 2 Voltage Low C-35
P1230 Power Supply Relay Secondary Circuit C-3
P1405 EGR Valve Feedb. Voltage High C-28
P1405 EGR Valve Feedb. Voltage Low C-28
P1405 EGR Valve Feedb. Incorrect Signal C-28
P1501 Immobiliser No or Wrong Coding C-5
P1502 Immobiliser No Signal C-5
P1503 Immobiliser Wrong Signal C-5
P1530 A/C Relay Voltage High C-41
P1530 A/C Relay Voltage Low C-41
P1600 Reprogram or Replace Electronic Control Unit (ECU) C-2
P1602 Knock Control Module; Replace ECU C-2
P1690 Check Light Voltage High C-43
P1690 Check Light Voltage Low C-43
P1690 Check Light Open Circuit C-43
P1740 Torque Control Voltage Low C-40
P1740 Continuous Torque Control C-40

These are the error codes:

Have you checked for fuel pressure? Have you checked for spark at the plugs? These are 2 key things an engine needs to run.

Yea , what's your question ? Doesn't start an run , only when you spray starting fluid into the engine ? You do or don't know what lean codes are ? Did you check the electrical circuit for fuel pump . Amperage draw test etc.... Check fuel pump relay ! Videos on youtube testing fuel pump electrical circuit . Did you change fuel filter ?

P0171 and P0174 OBD II Trouble Codes

The code means the O2 sensor is not heating up fast enough. It has nothing to do with the heater inside the car.
The sensor and the circuit would need to be tested to find out what the problem is. The code does not mean something needs to be replaced. Only tested.

Trouble Code: P0230

Fuel Pump Circuit Malfunction
Possible Causes:


Fuel pump control circuit is open or shorted to ground Fuel pump relay power circuit from ignition switch is open Fuel pump relay is damaged or has failed PCM has failed

P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

P0301 - Cylinder 1 Misfire Detected.


Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder


Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

tried testing the igniter also i would look into the injector, that will cause a single cylinder misfire and probably is your problem?misfires are not noticeable at higher speeds, which im sure you know but i would go that route, could have a pinched injector or a stuck one. one easy way to test is swap 3rd injector with another and see if that one starts misfiring instead, another rought is to get a cheap auto stethoscope and put it to each injector to hear if its opening and closing, compare with others. good luck.

HI
is your car have a strong or poor acceleration
check the:-
1- air flow meter sensor
2-fuel pressure regulator
3-fuel injectors
4-fuel and air filter
check it and ask for more information
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