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My engine light stays one. What is the cause - 2006 Volvo S40

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You need to have your problem fixed, if already fixed and engine still stays on then, you need to have the error code deleted on the ECU (electronic computer unit).

You can do this with a ODB port reader if you have one or have it done in a workshop.

Posted on Mar 30, 2015

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Posted on Jan 02, 2017

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Where is the oil sending unit on a 1996 mercury cougar xr7 ? Its cause my oil pressure gauge is bouncing up and down...i dont know why...can anybody please help me thank you so much


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The low oil pressure warning lamp will illuminate anytime the ignition switch is turned to the ON position without the engine running. When the engine is running, the light also illuminates if the engine oil pressure drops below a safe oil pressure level. To test the system, perform the following:
If the oil pressure light does not work, perform the following:
  1. Turn the ignition switch to the ON position.
  2. If the lamp does not light, check for a broken or disconnected wire around the engine and oil pressure sending unit switch.
  3. If the wire at the connector checks out OK, pull the connector loose from the switch and, with a jumper wire, ground the connector to the engine.
  4. With the ignition switch turned to the ON position, check the warning lamp. If the lamp lights, make sure the oil pressure switch is properly grounded in the cylinder block, and if so replace the oil pressure switch. If the lamp still fails to light, check for a burned out lamp or disconnected socket in the instrument cluster.
To diagnose an oil pressure light that stays on, perform the following:
  1. Check the engine oil level and top off as necessary. If the engine was 2 or more quarts low on oil, test start the engine after topping off the oil level and recheck the oil pressure light operation. If the light stays on, stop the engine immediately and go to the next step.
  2. Disconnect the wire at the sending unit, then turn the ignition switch to theON position. If the light remains on, check the wire from the sending unit to the gauge for being shorted to ground and repair as necessary. If the light goes out, turn the ignition switch OFF and go to the next step.
  3. Replace the oil pressure sending switch with a known good switch.
  4. Start the engine and check the oil pressure light operation. If the light stays on with the engine running, stop the engine immediately to avoid severe engine damage until the cause of the problem can be determined.

WARNING
If the oil pressure light remains on while the engine is started, stop the engine immediately. Do not operate the engine until the cause of the problem can be determined. Operating an engine with low oil pressure will cause severe internal damage.

Possible causes for an oil pressure light to stay on are:


Pinched or grounded sensor wireDefective oil pressure sending unitRestricted or severely leaking oil filterExcessive internal engine bearing clearance.Insufficient or severely contaminated engine oilBlocked oil pump pickup screen or severely worn oil pump

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1 Answer

What causes a 1997 chevy lumina and check engine light to stays on?


You need to find out what codes are set causing the CHECK ENGINE light to illuminate. GO to any Advance Auto or AutoZone and they will read the codes for free. Do not assume that just because a code mentions a part that the part is faulty, especially if there are multiple codes set. Come back here and tell us the codes and we can help you determine your problem. Without the code(s), there are dozens of things that can set the CHECK ENGINE light.

Sep 07, 2014 | 1997 Chevrolet Lumina

1 Answer

Engine light staying on


Try tightening the gas cap. If this doesn't fix the problem you need to take it to a mechanic or dealer that can read the error code that is causing the light to stay on.

Mar 27, 2014 | 1996 Nissan Quest

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Engine will not stay idling


Dirty throttle plates and idle speed control motor can cause stalling without setting check engine light. If your check engine light is on you will have to get the code out and continue from there. Vacuum leaks will also cause engine to stall but usley set check engine light.

Dec 21, 2010 | 2001 Chevrolet Suburban

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Light engine stay on when water temperature needle indicator is in the middle, engine works OK, and car too.


The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.

A flashing check engine light is an indication of a severe misfire or problem that is likely to harm your engine. Immediate diagnosis and service is needed.

Some specific causes for the light to be on are:

Gas cap left off, not tightened, not installed correctly, or needs to be replaced

02 sensor

Engine misfire - error might clear itself after 3 complete warm-up cycles; not restarts, but warm-ups

At start up for a bulb check - Should not stay on

Problem in the emission system, including clogged exhaust or the catalytic converter not functioning properly

Dirty/clogged air filter

Dirty MAF sensor

There are pages and pages of items that can cause a check engine light to come on. Having it checked with a scan tool will narrow down the problem area.

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1 Answer

Engine management light stays on car dries great been well serviced no unusual knocks


something like O2 sensor will cause the check engine light stay on, not too worries,or you may take it to dealer did a service.(the light may stay on on that year model even after service.)

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1 Answer

Engine light stays on, then engine light flashes while running crappy. If I touch the gas pedal just right engine runs fine and light stops flashing(but stays on). 1996 cavalier 2.4L OHV.


Most local parts stores like Autozone or Advance auto will check the trouble codes for free and help you get the parts you need to fix whatever is causing the engine light to come on.

Dec 02, 2009 | 1996 Chevrolet Cavalier

2 Answers

Service engine light stays on. Adjustment of gas


Hi:
The gas cap is usually a good suspect in this case, but to figure it out, you need to have your code scanned to figure out what is causing the light. Most auto parts stores will scan it for free, so give them a shot

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2 Answers

''Check Engine Soon'' light Stays On.


Must have engine computer scanned to get codes and determine cause of check engine light. Low tire light probably needs reset. Open passenger door and remove panel on side of dash. Reset switch should be located in that compartment.

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1 Answer

Engine light stays on a 97 olds achieva sl


Engine light stays on, low coolant light stays on , recently had a plastic housing replaced that was leaking, it was linked to thermostat, tranmission coolant,heater ect. Had the thermostat replaced also. Level of coolant is fine, does't overheat anymore, but now the starter wants to spin a couple of times and then it starts. The car has no rust, would like to hang on to it

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