stoliti

I hate to sound stupid but what is the VSV? So, I should replace the EGR valve, the vacuum modulator and the VSV?

I hate to sound stupid but what is the VSV? So, I should replace the EGR valve, the vacuum modulator and the VSV?

ok, the code says:

"P0401

Troublecode OBDII (Alpha) P Code

Troubleshooting P0401

The PCM has determined that there is insufficient flow in the exhaust gas recirculation system"

What is the main cause of the EGR failing?

Thanks! :D

I will try that. Is there any way that I can clean the EGR and put it back on or is it one of those sensitive items that "must" be replaced.

I bought my 96 LX450 with 89,000 miles and have been using 87 octane since and have 130,000 now.  I don't recall that the owners manual requires high octane for this engine.  I've never had a problem with the engine light.

For cleaning the fuel system, you can't beat BG 44K.  It costs about $15-18 for one treatment but it works wonders. (My local Toyota Dealer sells it, you won't find it at the local parts store)  Even better, take it to a shop that performs BG service and have them do the full Fuel system cleaning.  It cost $100+ but again, its worth the money.

Good luck!

←

WOW! I just bought my 97 LX450 with 97K miles with the check engine light on. I was told by many that it is typically a simple sensor that needs to be replaced. The dealer told me that they replaced the EGR sensor at the Lexus dealer recently. I took it to AutoZone and the computer read out said EGR. They also cleared my codes but they came back on the next day. I was told that the previous owner had been using low octane fuel and it was causing a carbon build up. Is there some kind of cleaner that I can buy to fix this? Also, it possible that something else can be causing the light to come on? I know there is a good chance that they DID NOT replace the sensor and I may have to do it myself.

But....since gas prices are also high, I believe that the previous user could have been using cheap fuel and causing a carbon build up.

Any suggestions or ideas as to what I should do first?

Stoliti~