My car has had service engine light on for a week or so. Car runs smoothand idles fine all the time. The service light remains on. Only some times either when engine could be cold or warm upon start up it back fires and stalls out. But only happenson half my start ups. When it does backfire after two temps to startthe third time it fires fine and car runs well.

I ran my SCT tuner and cleared the code upon start up of enginelight is gone after clearing code. But as soon as I restart code appears again. I cleared the code twice but still pullingRYAF1CZ code ~ what does this mean? How do I fix it?

My car has 49 K

 

Not a valid OBD code... Your tunning software must be bad. Find an update from SCT. Then try it again.

Here's a list of all the OBD codes
Mustang OBD-II Diagnostic Codes [align=center] Last Updated on:3/26/06[/align] [align=center] [/align] P0102 Mass Air Flow circuit Low Input.
P0103 Mass Air Flow circuit High Input.
P0106 EGR Barometric Pressure Sensor Input Signal is out of Self-Test Range.
P0107 EGR/BARO Signal circuit is Less Than Self-Test minimum.
P0108 EGR Barometric Pressure Sensor Input Signal is out of Self-Test Range.
P0112 Intake Air Temperature circuit Low Input.
P0113 Intake Air Temperature circuit High Input.
P0117 Engine Coolant Temperature circuit Low Input.
P0118 Engine Coolant Temperature circuit High Input.
P0121 In-Range Operating Throttle Position Sensor circuit failure.
P0122 Throttle Position Sensor circuit Low Input.
P0123 Throttle Position Sensor circuit High Input.
P0125 Insufficient Coolant Temperature to enter Closed Loop.
P0126 Insufficient Coolant Temperature for Stable Operation.
P0131 Upstream Heated Oxygen Sensor circuit out of range - Bank No. 1.
P0132 Upstream Heated Oxygen Sensor circuit Voltage High - Bank No. 1.
P0133 Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 1.
P0135 Upstream Heated Oxygen Sensor Heater circuit fault - Bank No. 1.
P0136 Downstream Heated Oxygen Sensor circuit fault - Bank No. 1.
P0138 Downstream Heated Oxygen Sensor circuit Voltage High - Bank No. 1.
P0140 Downstream Heated Oxygen Sensor circuit Faulty - Bank No. 1.
P0141 Downstream Heated Oxygen Sensor Heater circuit fault - Bank No. 1.
P0151 Upstream Heated Oxygen Sensor circuit out of range - Bank No. 2.
P0152 Upstream Heated Oxygen Sensor circuit Voltage High - Bank No. 2.
P0153 Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 2.
P0155 Upstream Heated Oxygen Sensor circuit fault - Bank No. 2.
P0156 Downstream Heated Oxygen Sensor circuit fault - Bank No. 2.
P0158 Downstream Heated Oxygen Sensor circuit Voltage High - Bank No. 2.
P0160 Downstream Heated Oxygen Sensor circuit fault - Bank No. 2.
P0161 Downstream Heated Oxygen Sensor Heater circuit fault - Bank No. 2.
P0171 System Too Lean - Bank No. 1.
P0172 System Too Rich - Bank No. 1.
P0174 System Too Lean - Bank No. 2.
P0175 System Too Rich - Bank No. 2.
P0176 Flexible Fuel Sensor.
P0180 Engine Fuel Temperature Sensor circuit - Electrical fault.
P0181 Engine Fuel Temperature Sensor circuit - Electrical fault.
P0182 Engine Fuel Temperature Sensor circuit - Electrical fault.
P0183 Engine Fuel Temperature Sensor circuit - Electrical fault.
P0187 Engine Fuel Temperature Sensor circuit.
P0188 Engine Fuel Temperature Sensor circuit.
P0190 FRP Sensor Signal Low.
P0191 Engine Fuel Temperature Sensor circuit.
P0192 Engine Fuel Temperature Sensor circuit .
P0193 Engine Fuel Temperature Sensor circuit.
P0222 Throttle Position Sensor B circuit Input Low.
P0223 Throttle Position Sensor B circuit Input High.
P0230 Fuel Pump Primary circuit fault.
P0231 Fuel Pump Secondary circuit Low.
P0232 Fuel Pump Secondary circuit High.
P0300 Random Misfire Detected.
P0301 Misfire Detected - Cylinders 1-10.
P0302 Misfire Detected - Cylinders 1-10.
P0303 Misfire Detected - Cylinders 1-10.
P0304 Misfire Detected - Cylinders 1-10.
P0305 Misfire Detected - Cylinders 1-10.
P0306 Misfire Detected - Cylinders 1-10.
P0307 Misfire Detected - Cylinders 1-10.
P0308 Misfire Detected - Cylinders 1-10.
P0309 Misfire Detected - Cylinders 1-10.
P0310 Misfire Detected - Cylinders 1-10.
P0320 Ignition Engine Speed (PIP) Input circuit fault.
P0325 A Spark Knock Occurred - Sensor Circuitry did not respond.
P0326 Spark Knock has not been sensed.
P0330 A Spark Knock occurred - Sensor Circuitry did not respond.
P0331 Spark Knock has not been sensed.
P0340 Camshaft Position Sensor circuit fault.
P0350 Ignition Coil Primary circuit fault.
P0351 Ignition Coil A Primary circuit fault.
P0352 Ignition Coil B Primary circuit fault.
P0353 Ignition Coil C Primary circuit fault.
P0354 Ignition Coil D Primary circuit fault.
P0355 Ignition Coil Primary circuit malfunction.
P0356 Ignition Coil Primary circuit malfunction.
P0357 Ignition Coil Primary circuit malfunction.
P0358 Ignition Coil Primary circuit malfunction.
P0359 Integrated Ignition On Plug failure.
P0360 Integrated Ignition On Plug failure.
P0385 Misfire Detection Sensor circuit failure.
P0400 EGR Flow Faulty.
P0401 Insufficient EGR Flow.
P0402 EGR Flow Excessive at Idle.
P0411 Secondary Air Injection System Flow Improper.
P0412 Secondary Air Injection System Control Valve Faulty.
P0413 Secondary Air Injection Solenoid did not change when activated.
P0414 Secondary Air Injection Solenoid did not change when activated.
P0416 Secondary Air Injection Solenoid did not change when activated.
P0417 Secondary Air Injection Solenoid did not change when activated.
P0420 Catalyst System Efficiency below Limit - Bank No 1.
P0421 Catalyst System Efficiency below Limit - Bank No 1.
P0430 Catalyst System Efficiency below Limit - Bank No 2.
P0431 Catalyst System Efficiency below Limit - Bank No 2.
P0440 Evaporative Emission Purge Control Solenoid Damaged.
P0442 Leak in Evaporative System Detected.
P0443 EVAP

 

I just emailed my Tuner and he said you may have to update your software as well... I don't know for sure. I also emailed SCT for you. They are pretty good about returning my emails. I'll let you know what they tell me if you still need help by the time they reply.

 

The symptoms your listing sounds like the famous P0340 Camshaft Position Sensor circuit fault. Have your alternator checked out. I had a 2002 GT with the same problem for forever, try to start get a slight backfire noise for 2 or 3 trys and then start and run just fine. Some startups though it would crank normally. Trust me, check into it, until then, after being embarressed on several occasions, *filling up with gas, leaving work, downtown lol* I found that if you press the gas while you are starting it, it gives a better chance of completely firing up.

 

that would be great. I have SCT XCAL 2 tuner. I thought code looked funny to me. I definitely went to the right place and it allowed me to clear DTC codes.

 

Was it a costly repair providing I have the same issue?