1999 Honda accord and im check engine light is on and I took it to auto zone and they gave me code p1402?
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DIAGNOSTIC TROUBLE CODE (DTC) P1402 EXHAUST GAS RECIRCULATION BLOCKED Features of the Circuit By any chance if high combustion temperatures are created by oxides of nitrogen then An Exhaust Gas Re-circulation (EGR) system which is the chief feature of this system will be boosted to counter this. This is done by supplying small amounts of exhaust gases back into the combustion chamber. Combustion temperatures are minimized as soon as the air/ fuel mixture dilutes the exhaust gases. The EGR valve has been specially designed to generate exhaust gases to the engine without using intake manifold vacuum. This valve regulates exhaust flow entering the intake manifold from the exhaust manifold through an orifice with an ECM controlled pintle. The pintle position is monitored by the ECM using inputs from the Throttle Position (TP) and the Manifold Absolute Pressure (MAP) sensor. This task over, the ECM then directs the EGR valve to operate as necessary by controlling an ignition signal through the ECM. The ECM further monitors the results of its command through a feedback signal. The desired EGR position can be checked with the help of a scan tool. A voltage signal representing the EGR valve pintle position is sent to the ECM by a 5 volt reference and a ground to the EGR valve. The scan tool can also be used here to note the feedback signal which is the actual position of the EGR pintle. The correct EGR position should always be close to the commanded or Desired EGR position. This Diagnostic Trouble Code (DTC) is capable of identifying an open or short circuit.
