Mar 102017

2007 Audi RS4I have a 2007 Audi RS4; it usually refuses to start when I leave it to cool down. The agents have changed the starter relay and it still does the same thing. The starter doesn’t turn and I can only hear the clicking sound from the relay. I usually press the starter button continuously for about 30 minutes until it starts.


Audi No Start

Well this particular vehicle has 2 starter relays. You may need to replace both of them. However you can do a little testing. Next time it will not start you can check for battery voltage at the “S” terminal when someone holds the start button. If you see battery voltage, replace the starter. If not you may need to trace the wiring or replace a relay or ignition switch.

Starter Wiring Diagram

Feb 192017

2012 Audi A5My Audi A5 convertible is having random problems all at once. The top won’t open, the rear camera is fuzzy, the seats don’t move forward/backward, or lean back. I think it’s electrical but I don’t know. I’m selling the car so I don’t want to invest a lot of money into it. Thank you for your help.


Definitely electrical. Could be a bad connection or corrosion at the battery terminals. A blown fuse may also be an issue. A blown fuse is a common occurrence if the vehicle has been jump started recently.  Check your battery and fuses first. If they all check out you are looking at having to trace wiring and testing each component.


May 132016

2007 Buick Lacrosse Code P2138I have replaced the gas pedal unit which includes the sensor 2 months ago on my 2007 Buick Lacrosse 3.8L. Has been working fine. Then the other day the check engine light came back on with the same code P2138 that says (reduce engine power) which means gas pedal and senor unit again. The problem I’m having the check engine light comes on, I drive it a few times it goes away, but then it will come on again a few days later back and forth, back and forth. What could be causing this to happen please.


The Engine Control Module (ECM) has detected that the APP sensor 1 and APP sensor 2 disagree more than 4.5 percent for less than 1 second. This turns on the check engine light. It is possible that the wiring or connections are faulty. Also possible that the parameters set in the ECM need to be reprogrammed. It is also possible that the “New” part is bad. I would anticipate the repair and part are covered under warranty and as such you should return the vehicle to the repair shop. There is a TSB – Technical Service Bulletin for the Code P2138 with reduced engine power which identifies a repair instrument panel to body harness connector. (see below)

CODE P2138 BUICK – Accelerator Pedal Position Sensor 1-2 Correlation

Code P2138 Possible causes

– Faulty Accelerator Pedal Position Sensor
– Accelerator Pedal Position Sensor harness is open or shorted
– Accelerator Pedal Position Sensor circuit poor electrical connection
– Faulty Electric Throttle Control Actuator

The Accelerator Pedal Position (APP) sensor is made up of 2 sensors that are housed inside one assembly. The Engine Control Module (ECM) supplies a separate 5-volt reference circuit and a low reference circuit for each of the sensors. The 5-volt reference for APP sensor 1 is supplied from the same source in the ECM as the 5-volt reference for the mass air flow (MAF) sensor and the fuel tank pressure (FTP) sensor. The 5-volt reference voltage for all of the sensors is supplied on separate ECM terminals, but the terminals are connected internally to a voltage supply. The APP sensor 1 sends a signal from the sensor to the ECM indicating the accelerator pedal position. The ECM actuates the throttle plates based on this information. If the ECM detects that the APP sensors are not within a predicted value from each other, DTC P2138 sets.

TSB 07-06-04-019E

Intermittent malfunction indicator lamp(MIL) illuminated, DTC P2138 with reduced engine power (repair instrument panel to body harness connector)

Affected models: 2005-2015 GM passenger cars and light duty trucks


  • Some customers may comment on an intermittent malfunction indicator lamp(check engine light) being illuminated with a message or an indicator that displays Reduced Engine Power.
  • The technician may observe on a scan tool DTC Code P2138 – Accelerator Pedal Position (APP) Sensor 1-2 Correlation set as Current or in History.

The condition may be caused by water intrusion into the instrument panel to body harness connector, which carries the APP Sensor signals to the ECM/PCM. The water intrusion results in a voltage difference between APP Sensor 1 and APP Sensor 3 that exceeds a predetermined value for more than a calibrated period of time, setting Code P2138.

Some examples of potential water leaks are: A-Pillar seals, Sunroof drain lines and windshield /cowl sealing.

The Fix:

  1. Verify that aftermarket equipment is not electrically connected to any of the APP sensor signal or low reference circuits or to any other ECM/PCM 5v reference or low reference circuits.
  2. Perform the diagnostic system check – vehicle.
  3. Locate the Instrument Panel to body harness connector, which may be located in and around the left hand kick panel area or inside the instrument panel. Depending on the vehicle and model year.
  4. Inspect for water leak in area. If necessary use a water hose to determine the source of the leak.
  5. Inspect the instrument panel to body harness connector terminals for corrosion and debris.
  6. If any corrosion or debris is observe, repair as needed.
  7. After completing the repair, verify the proper operation of the system.
Sep 282015

Hi, recently one of the pipes/hoses that is part of the suction jet pump has corroded and failed. The vehicle is an 1995 audi a6 2.8l v6 fwd, and ever since replacing this hose, the car won’t start but crank for ages. If the key gets turned to the ON position and then to the START position, it will just crank.However if one turns the key all the way to START immediately, the vehicle will start for 1 sec. and then die again.
any ideas?

Jun 232015

I have a 1997 audi a8 Quattro with 180,000 miles on it and for a while now the power and acceleration has been horrible ……i have to push down really far on the pedal for a while to get it up to a descent speed …and its kinda embarrassing ….especially at lights or a stop sign……freeway driving isn’t that bad but i can tell the power is nothing what it should be … thinking it could be the plugs or possible maf sensor but i changed the plugs about 5 months ago …..there is no check engine light on and no codes being thrown at all …..please help!!!

May 312015

My gas light was on and near empty, so I put $90 in. I drove away and the car still said it was on empty. I pulled over, checked to be sure the gas cap was on and tight and it was. I have continued to drive the car, which means gas is in it. Why is my gas sensor/ gauge not working and how do I fix it?

Mar 132015

Hi, i have a 97 Audi a4 quttro 1.8t, having some issues. have about 8 codes come up P1127, P0300, P0301, 0302, P0303, P0304, P0455, P0137. the car runs rich and bogs alot especially when starting after it has ran for a minute it tends to start rough and usually die unless i give it some gas. i am assuming those codes go hand in hand with each other. i have replaced spark plugs, replaced 2 old coils, cleaned the MAF, and checked intake for leaks. At this point im sure what to do to solve this issue. Could it just be the O2 sensors?

Feb 092015

Error code PO171 appeared and I am starting out with ordering an 02 sensor, fuel filter, plugs, and pcv. Car was driving ok while awaiting for parts to arrive, when I went to start the car, it took a very long time to start, and when it did, it conked out after stepping on the gas pedal. I know the problems aren’t linked, but don’t know where to start with the starting problem.