Question about 2002 Chevrolet Tahoe
Po 178 fuel composition sensor circuit low where is it location? 2002 chev tahoe engine size5300 v8
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Posted on Jan 02, 2017
Please use this link :
Posted on Aug 14, 2008
That normally means that you have a issue with your gas cap try replacing your gas cap first then diconnect the negative terminal of the battery for about three minutes to clear the memory and start the truck again
Posted on Apr 11, 2009
SOURCE: Tahoe 2002 service engine soone
Code p0178 is fuel compensation sensor circuit low input.
Code p0440 is evap emmision control system malfunction.
I retrieved this blog for you on the Flex fuel Issue.
How to fix SES P0178 and P0179 - Flex Fuel Sensor
What is Flex Fuel?
A flexible fueled vehicle (FFV) has a single fuel tank, fuel system, and engine. The vehicle is designed to run on unleaded gasoline and an alcohol fuel (usually ethanol) in any mixture. The engine and fuel system in a flex-fuel vehicle must be adapted slightly to run on alcohol fuels because they are corrosive. There must also be a special sensor in the fuel line to analyze the fuel mixture and control the fuel injection and timing to adjust for different fuel compositions.
What Service Engine Soon codes does it throw?
P0178 and P0179 are directly related to the sensor its self
P0178 - Fuel Composition Sensor. Sensor Circuit Low Volts
P0179 - Fuel Composition Sensor. Sensor Circuit High Volts
Can this really effect anything?
Yes, It can cause your truck to run richer then it should.
Also codes (P0440), should go away after replacing the Flex Fuel sensor.
How much does this sensor cost and what is the part number?
There are 2 part numbers (both are the same part):
The first one: 12568450 (older part number)
The second one: 12570260 (most recent)
From a GM dealer this part will run $613
From GMPartsDirect.com it runs $350
dealer will charge around $900-1100 to fix!
Where is the sensor located and what does it look like?
Passenger side, Front frame rail. Right behind the wheel well.
It has 2 fuel lines coming out of it and 1 power.
Actual pic from engine area:
Stock picture of the part:
What kind of tools are needed to replace this myself?
Size 13mm Socket
Fuel Line disconnects ($5 - $10)
I Circled the correct one to use:
How long does it take and is it easy?
Yes it is easy, and it takes about 2-3 hours depending on how you go about getting to it. Take your time and be careful! (a little bit of gas will come out of those lines)
I pulled off the passenger side wheel and went thru the wheel well with a friend under the truck helping. Hard to remove I don't recommend a DIYer on this one.
Posted on Aug 29, 2010
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160....O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
P0161....O2 Sensor Heater Circuit (Bank 2 Sensor 2)
P0162....O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)
P0163....O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
P0164....O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)
P0165....O2 Sensor Circuit Slow Response (Bank 2 Sensor 3)
P0166....O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)
P0167....O2 Sensor Heater Circuit (Bank 2 Sensor 3)
P0168....Fuel Temperature Too High
P0169....Incorrect Fuel Composition
P0170....Fuel Trim (Bank 1)
P0171....System too Lean (Bank 1)
P0172....System too Rich (Bank 1)
P0173....Fuel Trim Malfunction (Bank 2)
P0174....System too Lean (Bank 2)
P0175....System too Rich (Bank 2)
P0176....Fuel Composition Sensor Circuit
P0177....Fuel Composition Sensor Circuit Range/Performance
P0178....Fuel Composition Sensor Circuit Low Input
P0179....Fuel Composition Sensor Circuit High Input
P0180....Fuel Temperature Sensor A Circuit
P0181....Fuel Temperature Sensor A Circuit Range/Performance
P0182....Fuel Temperature Sensor A Circuit Low Input
P0183....Fuel Temperature Sensor A Circuit High Input
P0184....Fuel Temperature Sensor A Circuit Intermittent
P0185....Fuel Temperature Sensor B Circuit
P0186....Fuel Temperature Sensor B Circuit Range/Performance
P0187....Fuel Temperature Sensor B Circuit Low Input
P0188....Fuel Temperature Sensor B Circuit High Input
P0189....Fuel Temperature Sensor B Circuit Intermittent
P0190....Fuel Rail Pressure Sensor Circuit
P0191....Fuel Rail Pressure Sensor Circuit Range/Performance
P0192....Fuel Rail Pressure Sensor Circuit Low In put
P0193....Fuel Rail Pressure Sensor Circuit High Input
P0194....Fuel Rail Pressure Sensor Circuit Intermittent
P0195....Engine Oil Temperature Sensor
P0196....Engine Oil Temperature Sensor Range/Performance
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