Hi. I have a Lexus IS 250 - 2006 model. Vehicle won't start when you depress the engine start button. Had it diagnosis done and found out that the engine control unit is exceptionally hot and draining out all the battery power. The mechanic reckons that we must replace the ECU together with the inside cluster, new keys, immobiliser and other control units in order to get the vehicle to start? Can i not only replace the ECU only? What are my options? Can the ECU be recoded to my cars spec? Kindly advise! What other options do i have? This is going to cost me an arm and a leg!

SOURCE: The Lexus car remote key control model ES300

try this:

1. Start with key out of ignition, drivers door is open all others closed and
drivers door is unlocked.
2. Insert key into the ignition (DO NOT Turn) and Pull key out.
3. Perform these steps within 40 seconds.
A. Using the power lock switch on the drivers door, perform 5 lock/unlock cycles
starting with lock. Use an even pace and try to go about one cycle per second.
(1Cycle = 1 lock and 1 unlock).
B. Close, then open drivers door.
4. Perform these steps within 40 seconds.
A. Using the power lock switch on the drivers door, perform 5 lock/unlock cycles
starting with lock. Use an even pace and try to go about one cycle per second.
(1Cycle = 1 lock and 1 unlock).
B. Insert the key in the ignition cylinder.
C. Turn the ignition to ON (Do NOT Start) then back to OFF.
D. Remove the key from the ignition.
5. Press any button on remote for a minimum of 1 second.
System should now lock and unlock doors once.

6. Close and open drivers door.
7. Press any button on remote for a minimum of 1 second. System should now lock and
unlock doors. Once to confirm programming, twice to indicate programming failed.
8. Repeat steps 5, 6 and 7 for additional remotes.

SOURCE: Check engine light is on

no such thing as a catalytic computer... there is a catalytic converter ... part of the exhaust system so they may now be "guessing" that it's an O2 sensor. take the car to autozone... they will scan the codes for free.... post the codes here tho the lads and lasses there are pretty clever and will probably tell you what the codes mean.

Mike Vincent

• 358 Answers
• Posted on May 21, 2009

SOURCE: oil sludge buildup in engine; anyone gotten repair for free?

getting harder to lexus and toyota to take care of this problem. I have repaired many of them when i worked for lexus. I would car the 1-800 num. for leaxus support.

SOURCE: The fuse box layout for a Lexus RX 350, 2007 model

THERE ARE TWO FUSE BOXES ON THE CAR ONE UNDER THE DASH AND ONE UNDER THE HOOD. SHOULD BE ON THE RIGHT SIDE OF ENGINE COMPARTMENT WITH A COVER HELD ON WITH SCREWS OR LATCHES. ON THE INSIDE OF THE LID ON BOTH BOXES THERE SHOULD BE DIAGRAM OF LOCATIONS FOR THE FUSES

Testimonial: "Did not know about the one under the dash, is there a better explanation of what fuse or relay is for which? A pdf diagram maybe?"

SOURCE: My 2004 RX330 Navigation GPS DVD does not load

another thought is try disconnecting the battery for and hour or 2 and see if that resets it,your last resort may be (hate to say it ) dealer to look at it