Almost two years ago when the ck engine and trac off lights came on my 1999 Lexus ES300 had a hesitation problem that went from bad to worse in a short amt of time to finally the car could only be driven to the repair shop and they replaced an oxygen sensor which took care of it until now when it started all over again. They recently replaced some other kind of sensor located in the rear of the engine but it did not fix the problem. Even though the car was on the diagnostic machine for hours it still doesn't pinpoint the real problem. The quick diagnosis at Autozone showed the Fuel system problem (code 1354 I think). I told the repair shop this but that didn't seem to help. The new thing it is now doing is the brake (not the ABS) light keeps coming on and off. Is this a related problem?
DTC P1349 OR P1354: VARIABLE VALVE TIMING (VVT) SYSTEM MALFUNCTION
NOTE: Variable Valve Timing (VVT) sensor is also known as camshaft
The Variable Valve Timing (VVT) system controls intake valve timing in response to driving conditions. Electronic Control Module (ECM) controls Oil Control Valve (OCV) to ensure correct valve timing. A OCV is located in each cylinder head, underneath lower intake manifold. Oil pressure controlled by the OCV is supplied to the VVT controller. VVT controller then changes relative position between camshaft and crankshaft. VVT controller is located on the front of each intake camshaft. DTC P1349 is set if ECM detects valve timing does not change (fixed timing) for bank No. 1 (right cylinder head). DTC P1354 is set if ECM detects valve timing does not change for bank No. 2 (left cylinder head). Possible causes are: Incorrect valve timing.
Faulty oil control valve.
Faulty VVT controller assembly.
If you have a DTC P1354 & misfire codes for #2, 4, 6 bank 2 do not replace any ignition parts or the VVT sensors. Make sure vehicle is in time then test the VVT oil control valve with pocket screw driver for sticking. The 12 volt test will work the valve properly and sticking is not noticeable. Replace oil control valve and recheck. This should solve the problem.
Bank 2 is the bank at front of vehicle.
The brake lights turning on inermittently could be due to low fluid level in brake master cylinder and is not related to the problem.
December, 11, 2010 AT 6:05 PM
The red brake light will turn on for low fluid level in the reservoir, parking brake not fully releasing, or unequal pressures in the two hydraulic circuits. Normally the yellow ABS light will turn on too because a hydraulic system problem will compromise the effectiveness of the anti-lock system.
Low fluid that stays at the same level is usually due to disc brake pads worn and in need of a typical brake job. If the level is going down noticeably over a period of hours or days, there is a leak that must be addressed immediately. That will usually also cause unequal pressures.
This is not generally related to the Check Engine light. That light means the Engine Computer detected a problem that could have an adverse effect on tail pipe emissions. Diagnostic fault codes are just the starting point to get the mechanic into the right circuit or system with the problem. They rarely identify the defective part.