sensor circuit B that code P0407

there is no code p0407 soyou will have to give the correct code and engine size.

The engine size is a 5.4 L. All I could find was a P0405 & P0406. The shop pulled a P0407 and I could not find it either. I was wondering what the EGR secondary sensor circuit is.

WAITIN' ON hmac300 TO RETURN

HE'S MUCH MORE UP TO SPEED ON THIS NEW STUFF THAN I

JUST THOUGHT I'D SLING OUT SOME INFO

IF IT IS SUGGESTED THAT YOU REMOVE AND CLEAN THE EGR AND ITS PORTS

AUTOZONE CARRIES THE BEST CARB CLEANER AVAILABLE IN AN AEROSOL---IT CALLED "VALUCRAFT"...IT RUNS CIRCLES AROUND THE OTHERS, MOST OF THE TIME IT'S CHEAPER

I WAIT TILL ITS ON SALE AND BUY IN QUANTITY

ONCE WHEN TRAVELING THRU WEST VIRGINIA, I WAS LOW ON FUEL AND A MOUNTAIN STOOD IN MY WAY......I SPRAYED 1/2 A CAN OF VALUCRAFT ON IT, THE ENTIRE COAL DEPOSIT MELTED AWAY, LOOKED LIKE KANSAS AFTERWARD!

THE MEDIC

I checked the egr vlve the old way ..applied a little vacuum to it at idle and it killed the engine. Th eonly code that has come up since were Po172 & Po175. There is an innermitant hesitation on acceleration and an ocassion pop in the exhaust too. MAF seams to be functioning correctly. Is it possible the plugs are fouled do to the lack of air flow from a clogged airfilter? If so could that also be the source of the problem as in th espark plugs an poss ibly the front o2 sensors?

codes 172 and 174 are a fuel problem. here is the diagnostics for doing this. this must be a bi-fuel vehicle.
Diagnostic Aids

Enter this test only when all steps under QUICK TEST have been successfully completed and engine still does not start or if directed here from another test or chart. This test is only intended to diagnose:

? Heated Oxygen Sensor (HO2S).
? HO2S and VPWR circuits and connections.
? Compuvalve.
? Vacuum systems.

HO2S 11 and HO2S 21 circuits are monitored by compuvalve. Information is used by compuvalve for fuel trim calculations. HO2S PID should vary between 0 0.3 and 0.6 1.0 volt while engine is operating at 2000
RPM. Also, a change from rich to lean should occur more than 5 times during a period of 10 seconds at 2000 RPM. DTCs P0132, P0134, P0152, P0154, P0171, P0172, P0174 and P0175 are unique to alternative
fuel system and are set if compuvalve receives a continuously high or low input (more than or less than 0.55 volt for more than 120 seconds), or no activity from HO2S. Possible causes for these faults are:

? HO2S circuits are open or shorted to ground.
? Faulty HO2S sensor.
? Consistently lean or rich fuel system
? Faulty compuvalve.
? Faulty harness circuits (HO2S or VPWR).
? Intake air leaks.
? Plugged injectors.
? Pressure regulator inoperative.
? Exhaust leaks.
? PCV system.
? Ignition system faults.
? Low compression.
codes p0405 &406 i could not find at least for eninge operation. this cold be a computer problem as well as what is listed. but it looks more like theO2 circuiit.