V6 5vzfe Tacoma's does not have EGR valves. All the controlling is compensated by the o2 sensors; therefore, the o2 needs to be replaced at 100K to avoid a bad CAT converter.
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When you clear the check light ,you clear all data
needed to diagnose problems,so your best to leave
it & when the emission monitors run, it will go out,if
the correct repair was made & no other issues
That's a good place to start. Check to see if the EGR vacuum diaphragm is able to hold a vacuum. If not, the diaphragm is leaking air into the intake stream and leaning out the mixture so much that you have misfiring. If it holds vacuum, check for other vacuum lines to be off or it may be an intake manifold gasket leak.
you don't have a reset button but what you can do is chk for vacuum going to your egr. chek the "vacuum switching valve" VSV and see if you have an "EGR vacuum transducer" those are 2 very common problems with toyotas
CODE PO300 MULTIPLE CYLINDER MISFIRE DETECTED CONDITIONS.POSSIBLE CAUSES - AIR LEAK IN THE INTAKE MANIFOLD OR IN THE EGR OR PCV SYSTEM - BASE ENGINE MECHANICAL FAULT THAT AFFECTS TWO OR MORE CYLINDERS - EGR VALVE IS STUCK OPEN OR THE PCV SYSTEM HAS VACUUM LEAK - DIRTY OR STICKING FUEL INJECTORS - BAD COIL OR PLUGS - MASS AIRFLOW METER IS CONTAMINATED OR ITS SIGNAL OUT OF RANGE. PO451 - EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR RANGE PERFORMANCE CONDITIONS.POSSIBLE CAUSE CANISTER PUMP MODULE - CONNECTOR WIRE HARNESS CANISTER PUMP MODULE ECM - EVAP SYSTEM HOSE PIPE FROM AIR INLET PORT TO CANISTER PUMP MODULE CANISTER FILTER FUEL TANK VENT HOSE.FAULTY PCM.
most likely problem is to check ur egr valve, possible carbon build up or faulty unit will cause the misfire also will cause loss of power ,pinging if u remove egr possible to clean the carbon off if lucky if damaged beyond repair replace good luck
Codes do not tell you what is wrong. They only tell you if there is a problem with a specific system/circuit. From the information you have given it sounds like you might have a problem with the EGR valve which is causing the O2 sensor codes. There is no way to tell for sure but this is probably the most likely cause of your problem.
Here is a website that has a lot more information along with videos about how different sensors work: http://www.myautorepairadvice.com/obd_codes.html
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