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Good Day Everyone!

Guys,

I own and love my Lexus GS-300 (2003 Model) i am facing an issue for which i need perfect guidance as i don't know much about cars;

Check & VSC Lights are on + the acceleration of the car is not up to the mark (as before) missing in acceleration and specially car is breathing for 3 seconds approximately before acceleration on signals and humps whenever accelerated + the vibration of the car is increased when its in Parking gear.

I went to the Electrician and he put that tablet sort of computer beneath the steering and said that Race/Oxygen Censors have a problem and he mentioned exhaust filters too.

I have recently changed the timing belt and seals of the car and i asked the mechanic to change the plugs but he said your petrol average is fine no need to change the plugs as it gives me around 500kmh in full tank.

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Hi Salah...welcome to the Forum

I would suggest that something has changed recently to invoke the Check lamp, how long after the cambelt change has this fault occurred?

Has anything changed with the fuel...same brand? 

Driving styles or distances changed, driving over speed bumps? 

Generally, errors very rarely occur overnight without some warning or external influences being applied and sometimes it easier to find by working out what has changed over a short period before diving into replacing components. 

Let us know what you come up with. Maybe worth a second opinion?

Cheers  Trevor

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On 11/10/2016 at 7:21 PM, SALAH. said:

 

 

On 11/10/2016 at 7:21 PM, SALAH. said:

 

Good Day!

Dear Trevor,

Thank you for your concern and taking time out to help me with this issue;

I am using the same route almost everyday as i drive in Dubai so the routes are pretty clean. I drive almost more than 100km everyday however the Check & VSC Light were illuminated before changing the timing belt as earlier i thought that engine seals are broke due to which oil level went low and Check & VSC light illuminated however i changed the Engine seals (3 out of 4 as per the mechanic 1 was alright) and timing belt still no change in the lights (Mechanic pulled the battery cable for 5 minutes and lights went away but again after half hour they illuminated)

I am planning to clean the MAF Airflow Sensor and Throttle Body as of now maybe this resolved the issue?

Yesterday i went for Full Service (Wash) and till now after the service car is running smooth but Check & VSC lights are still there. 

 

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Had this in the wrong section but for any future reference it may help! Sorry if they are not in order

 

 

 

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@Dray81 @Trevor Catt

Hi Guys,

Once again I'll begin writing with thanking you for taking out time and sharing your expertise;

Items Replaced: Thermostat, Water Body, Plugs, Coils (Used from Scrap), Valve/Tepid Cover Gaskit (Left & Right Both), MAF Airflow Sensor (Used from Scrap) & Throttle Body Cleanup.

Another incidence occurred where my Cool/Hot Gauge stopped working while driving and I heard weird sounds and when I checked the radiator there was no water left it was hot and all smoking. Water Pump/Body was leaked due to which it damaged Thermostat so I have replaced both of them along with the Taped/Valve cover Gaskit and at the same time I replaced rest of the above mentioned items.

However I am still getting Check & VSC Light. Mechanic plugged the computer again and he said now there is some Left Bank & Right Bank error which as per him means that I have to change the Oxygen sensors of the car (They looks like plugs of the car).

The acceleration issue became much better after cleaning the throttle body as there was so much dirt inside it but still when I accelerate the car between 1 to 1.5 RPM I feel missing and vibration while driving.

 

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It could be a case of taking it for a blast to clear out the engine.

Keep it at relatively high revs to ensure its running clear.

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