My check engine light came on so I accessed the ECU and the check engine light flashed like this: 3 long, 4 short, 7 long, 7 short. Does that mean the code is 3477 or 3747. Any help is greatly appreciated.

thanks

 

When the Engine Control Module detects a problem it turns on the Malfunction Indicator Lamp and stores one or more Diagnostic Trouble Codes. All OBD-2 DTCs are four digits, and all start with 0 or 1. Your readout indicates two DTCs, 0304 and 0707.

0304 = Knock Sensor or circuit

0707 = Oxygen Sensor, right bank

You will find listings of DTCs from the factory shop manual at
http://web2.airmail.net/scutchen/max_faq/engcodes1.gif
http://web2.airmail.net/scutchen/max_faq/engcodes2.gif

 

Thanks Dan,

How great to get a clear answer so soon. I have one more question...what do I do next? I have driven the car and the lights have not come back on. Does that mean the erorrs were one time only, or is there a fix?

Thanks,

mike

[/I][/QUOTE]When the Engine Control Module detects a problem it turns on the Malfunction Indicator Lamp and stores one or more Diagnostic Trouble Codes. All OBD-2 DTCs are four digits, and all start with 0 or 1. Your readout indicates two DTCs, 0304 and 0707.

0304 = Knock Sensor or circuit

0707 = Oxygen Sensor, right bank

You will find listings of DTCs from the factory shop manual at
http://web2.airmail.net/scutchen/max_faq/engcodes1.gif
http://web2.airmail.net/scutchen/max_faq/engcodes2.gif [/I][/QUOTE]

 

Thanks Dan,

How great to get a clear answer so soon. I have one more question...what do I do next? I have driven the car and the lights have not come back on. Does that mean the erorrs were one time only, or is there fixes I can make? Any suggestions?

Thanks,

mike

[/I][/QUOTE]When the Engine Control Module detects a problem it turns on the Malfunction Indicator Lamp and stores one or more Diagnostic Trouble Codes. All OBD-2 DTCs are four digits, and all start with 0 or 1. Your readout indicates two DTCs, 0304 and 0707.

0304 = Knock Sensor or circuit

0707 = Oxygen Sensor, right bank

You will find listings of DTCs from the factory shop manual at
http://web2.airmail.net/scutchen/max_faq/engcodes1.gif
http://web2.airmail.net/scutchen/max_faq/engcodes2.gif [/I][/QUOTE]

 

I expect the Malfunction Indicator Lamp to come back on sooner or later. Probably sooner. If that happens, you should test the sensors which are implicated by the Diagnostic Trouble Codes.

It's worth the trouble to test a sensor before replacing it. Sometimes a sensor is just an innocent bystander. The Engine Control Module flags an Oxygen Sensor because the sensor's signal is outside normal bounds. Does that mean the sensor is "dead"?

-- It could mean that the wire between the sensor and the ECM is broken. Replacing a sensor won't fix that broken wire.

-- It could mean that a fuel injector is sticking open, causing that cylinder to burn rich, generating black soot which has coated the sensing element. Replacing a sensor won't fix that bad injector.

When the ECM points an accusing finger at a particular sensor, we should test the sensor before condemning it.

 

[/url] [/I][/QUOTE] [/I][/QUOTE]

Those codes illuminate under what,s called "two trip logic detection" meaning in a simple sense take the car for a drive and computer gets a mal code and then stores it. Next trip usually after engine has cooled down it recieves the same code again and then your light will illuminate.