FJ80 Supercharged Check Engine Light

[peacekeeper1961]

Regarding my pesky check intermittent check engine light: My mistake, it is not the O2 sensor code. The code is P0401. I did a forum seach and it doesn't appear that there is any common part failure. I guess I'll have to go through the FSM and do some more checking. I'm hoping I don't have to resort to driving the hour to the nearest dealer. Being a former Toyota Service Manager I know some of those techs just love to throw new parts at a vehicle til the problem goes away.

 

[Beowulf]

The code is P0401. I did a forum seach and it doesn't appear that there is any common part failure.

Yes, and no.

There is no single part that causes the P0401 but there are basically just 4 parts in this system with interconnecting hoses and wires.

The EGR Modulator, the VSV for EGR, the EGR Valve, and the EGR temp sensor. Very few temp sensors have been reported as bad and a lot of EGR valves have been replaced and NOT fixed the problem.

The cheapest "fix" is to check all the interconnecting hoses including the passage through the intake. Make sure those are clear and free of carbon. Cleaning the EGR temp sensor is also very easy as is the cleaning of the "filter" in the EGR Modulator. (These cleanings rarely fix a persistent P0401.) The easiest component to replace (and relatively cheap) is the EGR modulator. No tools and $45 or so.

The most likely culprit is the VSV for EGR and it's a bear to test because you have to remove it to test it and it's under the intake. It can be removed without removing the intake. Small hands help. Search for how-to. Probably a 2-banana job, 3-banana if you remove the intake.

Do the above if you want to throw parts at the problem. If you want to spend as little on parts as possible then follow the testing procedures in the FSM and isolate the problem.

-B-

 

[peacekeeper1961]

Thanks

Thanks for the reply. The light went off again today. It will likely pop on again tomorrow. I printed off your suggestions and will go through them and see what happens. There is one thing for sure, living with it is not an option.