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2003 Audi A4 1.8t emission control light keeps returning

I have a 2003 Audi A4 1.8T estate. The emission control light came on my dash and the following codes were read on the diagnostic - 18010 Power supply Terminal 30: voltage too low P1602. Idle control system RPM higher than expected P0507. and Fuel trim Bank 1, system too lean P1136. I have had the air flow meter changed and both air flow sensors. The light is then turned off and the car works perfect. After exactly 5 days it returns again with the same code. I have also had the vehicle smoke tested without any splits found in any pipe. Could this be a ecu reset issue? ie that the ecu needs a re programme to notice the fault has been rectified. Has anyone else had this issue? Cheers

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Have you got a cat in your exhaust?

Posted on Nov 25, 2013

Testimonial: "Hi Ray.. Yes there is a cat on the exhaust system. One of the lambda sensors is attached to it"

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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SOURCE: 2003 Mazda MPV trouble codes

check the pcv hose at the back of the intake manifold it often leaks and will cause several idle problems

Posted on Sep 29, 2008

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SOURCE: CHECK ENGINE LIGHT CAME ON P0171 FUEL TRIM BANK1 SYSTEM TO LEAN.

Hi. You need to clean the Mass Air Flow Sensor.
This is an easy job.
Get a can of throttle body or brake cleaner spray at your local auto parts store.

Open the hood, and locate the air filter box. follow the tube from the filter box towards the engine. Look for a small black box with 2 screws holding it to the air tube, Remove the wire connector and observe inside the sensor with a flashlight. You will see 2 small wires, and they will appear fuzzy or dirty. Spray the interior with the cleaner until the wires are nice and clean. Do not use compressed air, you will damage the sensor. Put it all back together and drive it.
This will def fix your issue. This is a vey common problem. If you do it yourself, you will save 70 + bucks.

Thanks for choosing FixYa, and a FIxYa rating for my assistance would be greatly appreciated.

Posted on Jan 23, 2009

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SOURCE: Need help with Audi A4 2000 1.8t Misfiring and Fuel/Air Problems?

replace the speed idle sensor

Posted on Feb 28, 2009

Outofworkjoe
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SOURCE: 1993 Volvo 940 error code 232

2-3-2* Fuel trim (lambda control) too lean or too rich at idle }If too rich: high fuel press., leaking injector } various driving problems Fuel trim (lambda control) too lean at idle Oxygen sensor

Posted on Jun 22, 2009

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