I have a 95 Blazer with a 4.3 engine. 160,000 miles and a SES light on. I scanned it with a Snapon Scanner and got the P0401 code. (The scanner only go's back to 96.) I changed the EGR valve and still have the SES light. Any suggestions?
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Do you have a code scanner? What code does it give? If you don't have a scanner and the car is drivable take it to an autozone and have them hook it up to the scanner to get the code or you can buy a cheap scanner for $50 if the blazer was not running rough before you may have not pushed a plug wire on completely and now the engine is misfiring on that cylinder. how many miles on blazer? the platinum plugs from should be good for 100K miles.
The OBDII Scanner will turn the ignition key forward but don't start vehicle and turn all lights and radio off and heater off. And plug the scanner in. Then it will run the codes and tell you what code(s) are write them down. Then you will hit the erase button to reset your engine light. If the light goes back on you have a problem it should stay off up to 50 miles if not then have your vehicle checked out usually it could be your O2 sensors or a MAF Sensor "MASS AIR FLOW SENSOR" that is faulty and or your intake tubes are loose allowing too much air flow in to the engine if this happens your car will be running too lean.