EricGX

Hi

I'm getting codes P0441, P0446, P0456, P0420 and P0430.

I have no cats in the car. My fuel consumption in town is around 12 mpg, so a bit higher than what others report. The cats were removed because they were in bad condition. I suspect excess fuel was sent to the cats. That would also explsin the bad mpg (?)

Any thoughts?

RCsGX

First 3 codes are evap leak codes. Last two are cat codes.

EricGX

Thank you RCsGX. Any idea what would damage the cats? Bad fuel? Lead? Where I live I have no idea of the quality of fuel going into the tank. Everyone says it's pretty bad. I'm thinking of putting new cats in. But i don't want to have the same problem again. I'm having the fuel system checked soon. Tank, hoses etc

RCsGX

Leaded gas, age, engine running too rich IE: bad air / fuel sensor.

EricGX

How can I test the air/fuel sensor?

I get really bad performance when driving from A to B if they are at very different altitudes. I'm talking about not being able to rev past 2 or 3 thousand rpm!

I have suspected the air/fuel sensor before. Is it the one just behind the air filter?

RCsGX

Use a MM.
https://www.clublexus.com/forums/rx-...esistance.html

Your air / fuel (upstream) sensors are below....