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Re: engine error lite P0465
Replacing the EGR valve, its actuator, or your DPFE sensor could all be at fault. I would probably start with the valve itself since it's an EGR leak code. Your gas cap was a wasted repair. The gas cap would cause a P0441 or 445 evap code, but not an EGR code.
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Re: engine error lite P0465
Gas cap is p0442 --urs is evap emission purge flow sensor circuit malfunction- u either given wrong code or wrong explanation of code if ur egr valve is leaking not hing to do with gas cap check flange and around egr valve for carbon or signs of a leak check gasket
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Use a Auto Scanner tool,fallow step by step reading process,take note witch code number "show" as defective,possible sensor fail, after replaces erase code using your Auto Scanner.Do it the same if another code number come out.
Unless you have a code checker with a reset switch, the easiest way to reset the light is just to remove the negative battery terminal for several minutes. That will usually do it.
Also, you don't actually need a code checker to pull the codes. With the engine shut off, you can quickly turn the key back and forth twice between the OFF and RUN positions. On the third switch from off to run leave it in the run position. The engine light will flash one or more two-digit codes. For example, if the light blinks twice, then pauses, then blinks three more times that's error code 2-3.
On the nissan is there a swirl chamber code that comes on also, If it does then its truly a EGR code, but if the code is 1441 and 400 then its not the EGR, 400 is the EGR system not the EGR you r fix and solution is to solve P1441 the 400 is for function only. the failure is 1441 here is the definition Fuel filler cap, replace your gas cap and if its the type that click as you close the cap make sure it does Leave the EGR alone
-after you change the part you have to reset/clear the code
-this can be done by either:
(1) using the OBD2 code reader that Autozone used OR since option 2 (below) is very quick
(2) disconnecting the battery for about 30 seconds (this will delete
all codes/radio presets/etc) but it will also clear the 'check engine'
-this is what I do AFTER i write down my radio station presets :)
-hopefully the new EGR valve resolves your issue after you CLEAR the code
...but that code just means a an insufficient amount of Exhaust Gas
recirculation (pressure difference) used to keep the emissions in check
-if it comes back, then there are a few other fixes to try also
-let me know if you need further assistance
-please remember to rate me `fix-ya`if it works