Question about 1994 Volvo 940

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My volvo 940 1993 keeps flashing the emission light when I restart warm car after a short trip - slow to start, need to give it some gas & rev

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  • Bill
    Bill May 11, 2010

    Are you talking about the check engine light?

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Sounds like you need an O2 sensor. You need to have it scanned, places like AutoZone will do this free of charge.

Posted on Apr 13, 2009

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You need to clean the falling.hose from turbo to intercooler and mix of oil and water in the intercooler and clean hose from intercooler to inlet manifold i hade the same thing in my 1991 940 turbo

Posted on May 04, 2009

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1 Answer

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.

Nov 01, 2010 | 1997 Toyota Tercel

1 Answer

Engine light on


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


Jan 08, 2010 | 2007 Ford Freestar Limited Minivan

1 Answer

Hello, Pls tell me what Happend when my engine light on bord is turned on.


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

Jan 08, 2010 | 2002 Hyundai Accent

1 Answer

ENGINE LIGHT COMES ON WHILE DRIVING MERCEDES BENZ C230 2005 TOOK CAR TO DEALER AND THEY FIXED TO THERMS & COOLANT SENSOR 2DAYS LATER AFTER PUTTING FUEL IN ( HIGH GRADE) LIGHT COMES ON I DON' T WANT TO...


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

Jan 08, 2010 | 2005 Mercedes-Benz C-Class

2 Answers

Code p0455 (evap emission cntrl systm) gross leak detected


po455 could actually be a loose or deffective gas cap

Jun 02, 2009 | 2000 Volvo S80

1 Answer

I have a BMW Z4 2003 2.5 with the exhaust emission


The Exhaust Emission Light can come on if the car is driven slowly over short distances.It will not happen on cars driven at speed. A short trip of ten miles at over 3000 revs should reset the warning light,although it may not go out for a couple of days after you have tried it . Hope this helps and saves a bill at the local dealer. JK

Apr 19, 2009 | 2004 BMW Z4

2 Answers

Engine light on


The service light has nothing to do with the engine light. It can't be trigged by the ECM.
The service light are only trigged by one of 3 counters (time since last service, engine hours or mileage).

The service light are easy to reset if you got a YM1999-2000 car.
1. Put the ignition on to pos.1 and press down the trip reset button on the instrument cluster and keep it depressed.
2. Put the ignition on to pos.2,
3. When the service light starts to flash then release the trip reset button. Now you have reset the service reminder lamp.

You need to read out the DTC's from ECM to be able to fix the check engine light.

Apr 15, 2009 | 1999 Volvo V70

1 Answer

Car running problem


Ok Slow deceleration rev responce was part of the ECU software to keep the emissions down ,however if this has only just started you can try to reset the IAC valve ,the procedure is as follows.

Turn ignition key on ,unplug the IAC valve ,turn the key off ,replug the IAC valve. do this 3-4 times .Then start the engine while holding the gas pedal to 2000 rpm ,then slowley let the go of the gas pedal till the engine idles .

The IAC valve is located on the throtle body and has 4 wires to it.

Sometimes the throtle body needs to be cleaned and then reset.

Jan 02, 2009 | 1999 Daewoo Lanos

1 Answer

Service light


key off, push in and hold trip odo, turn key to position 2 ( all dash board lights are now on) DONT START the car, KEEP the trip button pushed in, start the car IMEDIATELY the service light starts to flash, then release the trip odo button. Sometimes takes a couple of goes.

Sep 23, 2008 | 2002 Volvo S60

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