Code P401 came on at inspection. chg EGr valve and modulator. Check engine lite keeps coming back on HELP


Asked by Sep 25, 2007 at 10:00 PM about the 2001 Toyota Camry Solara

Question type: Maintenance & Repair

My car 2001 toyota solar failed inspection, EGR syste. I put in a new egr valve and modulator. Disconnected neg terminal, drove about 10 miles check engine light is back on. what else do I need to do?

6 Answers


Make sure you have vacuum going to the valve when you increase the RPM's. Check the hoses for leaks or kinks.

3 of 3 people found this helpful.
Best Answer

You may just want to check your gas cap also and make sure there is not any air coming through or it will throw off the sensor. Just a quick cheap check.

4 of 4 people found this helpful.

I change toe gas cap. Now my gas tank has a positive pressure, but the light is still on. I try to trace the leak in the gas line and in the emission to the carbon vapor trap container. So far, it is not successful. The shop did not really fix this problem. I already waste time and money at the dealer. I would like to hear any successful from the Toyota Camry owners.

4 of 4 people found this helpful.

I changed the EGR modulator, removed cleaned the EGR valve and found the VSV switch moved the tubes so it didn't pinch. I found the EGR mod on Ebay for $25, valve gasket $3 at auto parts store, and new hoses for $3. I have 159,000 miles and needed to register the car but it failed due to D401 code. I took my time and went step by step. The VSV is in a hard place but lift the car, put on blocks and shimmed under the car, located the hose to VSV and moved them. If your VSV is bad buy it on Ebay used for $25, I didn't need to but almost bought. We'll see in a few days if I need to replace the VSV switch but for now the "Engine light" is and I can register now.

2 of 2 people found this helpful.

Check your gas cap. I changed mine out and then it passed inspection. Sometimes this resolution is completely overlooked.

1 of 1 people found this helpful.

Hi. You need to change the gas cap original You can go to Toyota Dealer and they turn off lights after set the gas cap. Good Luck

3 of 3 people found this helpful.

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