Question about 1998 Mercedes-Benz SLK

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Check engine light comes on as gas level reached 1/4 tank which causes low fuel light to flash in my 98 MB SLK230...any idea as to the cause besides bad gas cap?

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Have you had the fault codes read? If not, why not take the car to an autoparts store and have them retrieve any codes stored in the computer. Most parts stores will do the scan for free. It could be an emission related problem, but getting the codes should narrow the cause down. The check engine light indicates the computer has noted a fault in one of the car's systems. Hope this helped and best wishes.

Posted on Sep 04, 2009


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Posted on Jan 02, 2017


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2013 Kia Optima. Fuel gauge shows 1/16th of a tank and the low fuel light is not on. Engine shut down. Out of gas. Add gas. Car starts up. What would cause the gauge to misread in this way?

most fuel gauge readings are not that accurate anyway so its out of fuel but not what the is guage reading. but the fuel level sensor in the tank may be at fault sound like its the prob but the instument pack should put the low fuel light on if its fitted on your vehicle spec but not always fitted even though the warning light is present hope this helps

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Got a 98 honda accord just changed out vtec sensor on it and it still lags and engine light and oil light are still on any ideas anybody ?

VTEC engines use some oil. A low oil level will cause the engine to go into "stumble mode" and the CEL to come on.

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02 blazer LS zr2 gas gauge when i turn the key the needle goes all the way to full then when i start the car it bounces a little between 1/2 and full and when im in drive is slowly comes down but is not...

Fuel Gage
The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gage defaults to empty if:
• The PCM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates.

Hooking up a professional or factory scanner an checking input data to the PCM from the sending unit inside the fuel tank ,viewing the information sent to the IPC , Checking for diagnostic trouble code's .
DTC P0461
DTC P0462
Circuit Description
The fuel level sender changes resistance based on fuel level. The PCM monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is high and the PCM senses a high signal voltage. When the fuel tank is empty, the sender resistance is low and the PCM senses a low signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percentage in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics.

Install a scan tool.
Turn the ignition ON, with the engine OFF.
With a scan tool, observe the Fuel Tank Level Remaining parameter in the PCM data list.
Does the scan tool indicate that the Fuel Tank Level Remaining parameter is less than the specified value?

No DTC'S - diagnostic trouble code's stored ,use this diagnostic procedure
Fuel Gage Inaccurate or Inoperative
• Refer to Fuel Level Specifications in order to verify the correct fuel level sensor readings. The Fuel Tank Level Remaining parameter is available in the scan tool in the PCM data list.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
This step tests for a high resistance in the signal circuit and the low reference circuit of the fuel level sensor.
DTCs will be set in the PCM when you perform this diagnostic table.
Schematic Reference: Instrument Cluster Schematics
Did you perform the Instrument Cluster Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Instrument Cluster
Disconnect C104.
Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit of the fuel level sensor and the low reference circuit of the fuel level sensor on the male terminal side.
Turn the ignition ON, with the engine OFF.
Important: Verify the J 33431-C resistance settings with a DMM.
Vary the resistance on the J 33431-C from 40-250 ohms.
Refer to Fuel Level Specifications in order to convert from resistance to fuel gage display.
Does the fuel gage display the correct fuel level?

How to test fuel gauge tank sending unit P0463 GM

Dec 19, 2017 | Cars & Trucks

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P0463 Fuel Level Sensor Circuit High Input Any ideas on the problem and possible solutions?

P0463 - Fuel Level Sensor Circuit High Input
An excessively high voltage is sent from the sensor is sent to ECM.

The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the ECM or PCM.

It consists of two parts, one is mechanical float and the other side is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes
- Fuel level sersor circuit harness or connectors is open or shorted
- Fuel level sensor may be faulty

Possible solution
Replaced fuel level sensor.

Hope helps (remember to rate this answer).

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Fuel gage not working but low fuel light staying on what will cause this? Rita

sounds like sending unit or float in the fuel tank is broken check for fuel tank damage under car

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2 Answers

Gas gauge goes to empty and then full after fillup

very well sounds like the sending unit in the tank. Try running some octane booster and fuel injection cleaner in tank of the truck to loosen any deposits on the float.

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1 Answer

GMC envoy after I filled gas tank the low fuel light came on and as I was driving it would go off than come back on after a few miles the check engine light come on stayed on and the low fuel light still...

You will need to replace the fuel level sensor which is in the fuel tank.They have a lot of problems because the metal fingers on the sensor wear off and gives you the incorrect readings.This will also cause the check engine light to come on.You will probably have a level sensor code.This will be a lot easier if the fuel level is down to about a quarter tank or less.Also you should be able to get just the level sensor and not have to get the complete fuel pump module.Good luck.

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Check gage light comes on for 2004 chevrolet trailblazer''

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1 Answer

Low level fuel lamp

beleive it or not its more than likely a bad gas cap,pressure in the gas tank is leaking pass the cap,on some cars it makes the check engine light come on

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