Hi I have a problen with a Lexus IS200, 2000 model. When you take off frm a standing start, the engine lacks power until the car reachs 60ks/h. I have checked fuel pressure and flow and all are within specifications. There are no fault codes in the computer's memory and have also checked exhaust flow and it is showing no problem with the a blocked exhaust. Also checked valve timing and engine vacume, and bothe show to be ok. Checked map sensor and throttle position sensors and all ok. Checked ignition timing and timing advance on reving, all ok. The car seems to take off in reverse better than in drive. Please help?

Marvin

• 85242 Answers
• Posted on Apr 15, 2009

SOURCE: How to locate the oxygen sensor in a LEXUS LS430 (Bank1 Sensor1)

the O2 sensor for bank one sensor one is located between the catalytic converter and the engine in the exhaust head pipe. see photo of your engine cylinder layout, the sensor u want to replace is the one at the cylinder #1 bank on right.

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.

SOURCE: High RPMs

yes its related to knock sensor because car is running rich in fuel, and car runs of on safe mode, so overdrive will be off. have you and a friend replace it. remove intake assembly, then intake manifold, but first remove your anifreeze from radiator, trust me you want to remove antifreeze! their are brackets by the fire wall to hold down the manifold, thats the hard part is taking it off and putting that on since not to much space to work on it. on the block you'll see the two knock sensors, has 2 wires each, knock sensors cost between 150- 200 a piece, still cheaper than dealership putting it on. also buy some liquid gasket because you will need that. after putting it all back together reset the ecu and you should be fine,

SOURCE: 1993 Lexus LS400 acceleration stalls or surges

I HAD THE SAME PROBLEM WITH MY CAR. 93 LS 400. THAT WOULD BE YOUR FUEL FILTER OR THE FUEL PUMP GOING BAD. TRY CHANGING THE FILTER FIRST. THE DEALER TRIED TO CHARGE ME $980 TO CHANGE FUEL PUMP.

SOURCE: check engine light on, replaced oxygen sensor before catalyst,

• Water or corrosion in the connector
• Loose terminals in the connector
• Wiring burnt on exhaust components
• Open or short in the wiring due to rubbing on engine components
• Holes in exhaust allowing unmetered oxygen into exhaust system
• Unmetered vacuum leak at the engine
• Bad o2 sensor
• Bad PCM