Lexus GX 2004-09 :: P2440 Code - Pump Vacuum Noise


Sep 8, 2015

It showed up yesterday and I looked it up that it's the Secondary Air Injection System Switching valve stuck open. I cleared the code but this morning I heard the pump vacuum noise, which I have never heard before but the code didn't come back on. [URL] .....

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Lexus GX 2010+ :: Secondary Air Injection Valve Failure - Code P2440

Just got the dreaded p2440 code which is the secondary air injection valve failure. Not only do you get several lights on the dash, you also get limp mode with this code.

My GX is a 2011 with 46k, and even though several Toyota vehicles have had their warranty extended to 10yr 150k for this very system, Lexus has done no such thing.

The dealer was very familiar with this issue and knew it wasn't covered under any existing warranty. He said it's "around $2000" to fix because one of the valves is still under the intake manifold.

Even though I hate to "RIG" my GX, I ordered the bypass module from EBAY. It blocks the system off and tricks the ecu into thinking all is well.

For those not familiar, this system runs on cold starts for 30 seconds or so to warm up the cats, it has no other function.

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I have a 2010 GX460 with about 81000 miles on it. I recently got the above codes and after researching it I decided to take apart the air injection valves, and also the motor to see what was going on.

Luckily these parts are very easy to access on our cars. Take the engine cover and front plastic cover off. The two valve are on either side of the cylinder head, and the pump will be on the left hand side, front of the engine bay.

I ordered two new valves, and ended up just cleaning out my pump.

Here are the Part Numbers:

VALVE ASSEMBLY, AIR SWITCHING
2570138100

VALVE ASSEMBLY, AIR SWITCHING
2570238050

This is exactly what happened: [URL] ....

Here is what both of my valves looked like:

Here is what the air pump looked like:

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