Hey all, about a week ago, just before my annual visit to the smog station, i get the P0453 and the infamous engine light. Research is leading me to possible fuel tank pressure sensor is bad or has poor connection. Having difficulty with a possitive location of sensor. Hoping I don't see a fuel tank removal in my future. Go easy on me, I'm old and fat

 

Look on the bright side. You can use your prodigious gut to hold up the fuel tank while gasoline spills on your chest. Just don't smoke.

Not having personal experience with that particular code - the check engine light means nothing besides telling you to hook up a scan tool and find out what's up - I would guess it has to do with the evap[oration control] system. You can look up codes online. The evap system consistes of a vacuum valve in the engine compartment and a bunch of valve stuff under the passenger side rear fender. None of that requires pulling the tank, thank heavens. You still shouldn't smoke when noodling with it.

The sensor is probably in the engine compartment. There is a solenoid valve hooked up to vacuum tubing near the radiator expansion tank. The pressure (vacuum) sensor is probably part of the valve.

 

Gas cap on tight and seal is intact?

Of all the dumb things that can cause you to fail a smog check I’m reticent to admit that that one got me during my very short stint in California.

 

Let us not forget, just like seeking a gas leak, a lit cigarette is good for diagnosing a loose gas cap.

 

I am getting same code. What part did you ended up replacing? Will be very helpful. Thanks.

 

Mcdaddio, if I understand things correctly, this sensor is actually measuring vacuum, not pressure. Maybe someone can correct me?

If so, while a sensor may be the issue, a common thing would be a charcoal canister (which is basically the vent) that is clogged - this often happens from people that continually "top off" their tank. This can create EXCESS (high) vacuum in the tank. Assuming, so far, I'm on the right track... how much "whoosh" do you get when you open the gas cap after driving for a while? It shouldn't be excessive.