I have a 91 lexus ls400. I had a engine code diagnostic done and the codes 51 and 91 came up. On my paper work it states that code 51 relates to the egr solenoid and egr tranducer valve.Is a egr solenoid also called something else or what exactly does these codes pertain to? Thank you
Is the egr solenoid also called an egr vacuum modulator on 1991 Lexus LS400
No the EGR modulator is a brown plastic device slightly smaller in diameter to a coffee cup and about an inch high it has three small hoses going to it and a slightly larger diameter hose going to it from the bottom, it is located at the rear of the engine compartment (on the engine). The solenoid has a two wire electrical connector on it and two vacuum hoses at one end of the solenoid its a little over an inch long (blue maybe black in color). Look under tech articles here to see how the system works.