[moneyjohn]

Hello folks,

Yesterday, Engine Service Soon light lighted up in the morning. I took car to AutoZone and was told the code P0455, issue with Evap. I called up local guy and asked for the cost of diagnostics, he told me $100, essentially an hour of work. Called up the other place and was told $250. I asked him why. His answer was, he uses genuine Nissan stuff to find out these error codes whereas AutoZone uses a generic one. So there could be more than one problem.

I have hard time buying this argument of Generic vs genuine Nissan equipment to find an error code. I wonder if that really makes difference.

If it makes any difference, my car has 83K miles on it, car is in lot better condition than comparable cars (according to $100 diagnostics guy).

Thanks in advance.

 

[i68k]

to find a code, any code reader will work.
to diagnose the car, a better scanner will show more vitals.

P0455 NISSAN - EVAP Control System Gross Leak Detected

what model b15 do you have? do you hear any loose hoses? you have a gross/large evap leak, did you check your fuel cap, oil cap etc? it's possible the maf or tps are failing/dirty if you dont find air/vacuum leak.

 

[moneyjohn]

I have 2006 Sentra 1.8S Special Edition.

Fuel cap is fine, don't know about oil cap. MAF and TPS don't know. The problem is, I don't know how to find these parts/places to check. I am a total noob..
But I do get gas smell sometimes in the car.

 

[Drifter666]

Based on past experience. It's probably the Vent Control Valve or the Canister. Both can be found behind the rear left side tire.

 

[Lucky13]

i'm having the same problem as well. it's been setting off the SES light ever since i bought the car. i had a new engine put in the car about a month ago so i know it's not the actual EVAP. it keeps coming on and i keep resetting it. i don't know exactly what is setting it off.

 

[moneyjohn]

Based on past experience. It's probably the Vent Control Valve or the Canister. Both can be found behind the rear left side tire.

Thanks, so how much should this cost if labor is $98/hr? I am total noob with cars so I won't try to DIY.

 

[i68k]

replacing the canister is not more than 2 hour job. however a canister is not cheap, you will need one if your is cracked open. the vent valve is less than an hour work, its only 2 bolts and an electrical harness, take a DIYer less than 5 minutes. be sure to use a genuine nissan oem vent valve if you need another one.

but from your code you have a gross leak. usually the ecu will diagnose the purge and vent valves before throwing a general evap code. things like cam&crank sensors, maf, tps, egr, fuel cap, pcv could all cause this if they failed horribly. assuming youve checked multiple time for vacuum leaks and broken/disconnected hoses, its gross leak, you should hear it.

 

[JudoJohn]

if it is a gross leak, you can find with smoke. Call aroudn to shops to see who might have one. that will pinpoint the leak(s). then you will know exactly what to change.

 

[Drifter666]

I agree with JudoJohn. Best thing to do is get it on a smoke machine and figuring out where the issue is. Then you can start putting a price in mind on how much this is going to cost.

Also 98$ an hour seems extremely high to me.