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PO403 is a bad egr circuit & 406 is a bad egr valve. 403 may be triggering 406. Make sure the wiring is in tact with good voltage & ground connectors first. repair 406, clear codes & you may have solved both probs. Poss bad egr valve too, good luck
CODE PO134 - HO2S 11 BANK 1 SENSOR 1 INSUFFICIENT ACTIVITY CONDITIONS. CODE PO403 - EGR SOLENOID CONTROL CIRCUIT MALFUNCTION. CODE PO405 - EGR POSITION SENSOR CIRCUIT LOW INPUT CONDITIONS. PROBLEM COULD BE THE EGR SOLENOID OR EGR POSITION SENSOR.
IF IT IS THE CHECK ENGINE LIGHT YOU CAN GO TO AUTO ZONE OR WHAT EVER YOU HAVE LIKE IT IN YOU AREA AND THEY WILL DIAGNOSE IT FOR FREE AND SOME TIMES MAKE RECOMENDATIONS ON WHAT TO DO AND THEY PRINT THIS UP SO YOU KNOW THEY ARE NOT TRYING TO SELL YOU PO403 IS LIKELY A SHORTED EGR CONTROL SOLENOID
Trouble code P1698 means: No CCD Messages Received From The TCM
code P0403 means-EGR solenoid circuit short or open
On the intake close to the EGR there is a solonoid that has wires and vac lines going to it. Make sure the wires are connected and not shorted.
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