Question about 1999 Subaru Legacy

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Outback wagon no power going up hills.

1999, 100,000 miles the check engine light comes on replace knock sensor.

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  • nancy kern Mar 12, 2009

    did replace the censor still it wont climb hill and light is still on.

  • Car Fixer May 11, 2010

    What's the question? Are you talking about a P0325 by chance? A friend with a 99 Subaru had that code, it just needed a new knock sensor.

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  • Expert
  • 184 Answers

What's the check engine light code? You need to get the code(s) read using a code reader and then we can help. A place like AutoZone will read the code for free and then you can look it up at http://www.obd-codes.com/trouble_codes/

Posted on Mar 14, 2009

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1 Answer

I replaced the knock sensor, what else could be causing acceleration problems on hills?


The knock sensor code does not always mean the sensor is faulty.
The sensor picks up noise and vibration in the engine such as a spark knock would generate, and the computer slows down the spark timing to fix it. If the noise or vibration continues, the code is set.
Could be a noisy valve, or a problem with the crankshaft or other component.

Aug 13, 2012 | Cars & Trucks

1 Answer

2000 outback check engine light on all the time, changed front o2 sensor, changed fuel cap, unplugged battery, and none turn this light off.\r\n any suggestion?


You have to hook an OBD 2 scan tool up to the data link connector and check to see what code is present. If you have a knock sensor code, you need to replace the knock sensor. If you get a P0420: Catalyst system efficiency below threshold, you will need to replace your catalytic converter. But if it is nothing important, the only way to clear a check engine light is with a scan tool. You can usually go to any aftermarket parts store and they will check and clear you codes and light for free. I hope this info helps.

Jul 27, 2011 | 2000 Subaru Outback

1 Answer

Hi, I had the knock sensor changed in my 1997 Legacy Outback by an independant shop. I drove it the one mile back to our house and was amazed at how quiet it was to not have the ticking sound! But, now...


free check engine code read at auto zone. we replaced a sensor 15$ our spark knock sensor is still out but ran fine for two years. a month ago lost power sputtered with ac on , turned out to be a spark plug wire 29$ set of four we replaced ours with one we had from another car runs great again

Jul 18, 2011 | 1997 Subaru Outback

2 Answers

Check engine light, knocking? PCV Valve?


I have this same vehicle. The "check engine" light warns you that the input from a sensor is not valid. To locate the problem sensor you need to have the fault codes downloaded and interpreted. I am sure your PCV has little to do with this. The burning smell cold be oil from your transaxle seals being thrown up onto the exhaust pipes. The outback is a sophistecated and refined vehicle that requires sophisticated equipment to work on it. If you have engine "knocking" it is likely to be the knock sensor and if this is the case, you need to have it remedied very quickly

Mar 22, 2010 | 2000 Subaru Outback

1 Answer

2000 Subaru Outback Wagon (100K miles) with P0420 Code


I do not know for sure if this is the problem you are having, But, I have noticed that from 95 up to 2002 I have seen a lot of PO420 codes that have been just the sensor. I do not know if it was a weak sensor or just that program telling it that it is below threshold. I did notice that if the vehicles are run for a long trip at highway speed it goes out. I wish you luck and have a great day.

Jan 12, 2010 | 2000 Subaru Outback

1 Answer

P0420 and check engine light


A p0420 code is set when the computer determines that the catalytic converter isn't doing it's job. In almost all instances that code can't set as a result of a bad o2 sensor so they probably didn't have to be replaced. The catalytic converter will need to be replaced, prefferably by an oem part. This can be pretty expensive and should be considered before purchasing the vehicle.

I have replaced a few bad converters on late model subarus in the past few years.

Apr 18, 2009 | 2003 Subaru Outback

1 Answer

1999 legacy outback no power going up hill,new knock sensor


Check your tail pipe for color. If insides are black you are running rich and it all may boil down to an oxygen sensor or an EGR valve. EGR valves are the most common causes for the 'check engine' light to come on. Your trouble codes will tell you what it is. Some auto stores will check it for free or you can buy an inexpensive checker.

Mar 12, 2009 | 1999 Subaru Legacy

1 Answer

99 outback wagon won't climb hills,check engine light comes on.


Get the P code read at your local parts chain store for free. It sounds like you need to find this out very soon. The code will tell you exactly what part is failing.

Mar 12, 2009 | 1995 Subaru Legacy

1 Answer

2005 Outback Wagon Code P0420


PO420 is for catalyst system efficiency below threshold. I have seen this many times on vehicles from 96 up. It is due to the system not burning the fuel at what it considers an acceptable rate. Todays fuels are not the best we could have for internal combustion and sometimes it will set off the light. I tell my wife she is too easy on the car and it's not burning the fuel proper. After a couple days it goes out. It will not harm your engine and should go out again. Fuel system cleaning additive will also turn of light. Good luck and enjoy your Subbie. Greatest car ever Built.

Jan 08, 2009 | 2002 Subaru Outback

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