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Incorrect sensor readings

cvhs18472

By cvhs18472
in 986 Series (Boxster, Boxster S)

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cvhs18472 Member

cvhs18472

Posted
Posted

I had the fault codes 1124,1127& 0455 after I got a CEl. I reset the codes and checked the gas cap. The 98 boxster started to idle poorly and shut off. I restarted and it ran well. I took it to my mechanic and it showed no codes or pending codes, but as he has watching the run data he noticed tha even though the temp guage in the car showed 180, the coolant temp was showing 38-41C and the air temp sensor was showing in the minus range. What are the odds of both sensors going bad at the same time. Anyone have any ideas? Please help. Thanks, Ed

cvhs18472 Member

cvhs18472

Posted
  • Author
Posted
I had the fault codes 1124,1127& 0455 after I got a CEl. I reset the codes and checked the gas cap. The 98 boxster started to idle poorly and shut off. I restarted and it ran well. I took it to my mechanic and it showed no codes or pending codes, but as he has watching the run data he noticed tha even though the temp guage in the car showed 180, the coolant temp was showing 38-41C and the air temp sensor was showing in the minus range. What are the odds of both sensors going bad at the same time. Anyone have any ideas? Please help. Thanks, Ed

Nobody has any ideas on this. ? Do you think that my DME needs to be reflashed, or is it a case of two bad sensors? Is there a way to check the sensors for their functionability. PLEASE , IDEAS. ED

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RFM Member

RFM

Posted
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Posted

Hi

I have some questions: the car showed 180 - Fahrenheit i guess

the coolant temp was showing 38-41 C - what means Celsius

Are you sure if the tester is compatible with the car ?

cvhs18472 Member

cvhs18472

Posted
  • Author
Posted
Hi

I have some questions: the car showed 180 - Fahrenheit i guess

the coolant temp was showing 38-41 C - what means Celsius

Are you sure if the tester is compatible with the car ?

Yes I am. The 38-41C translates to around 105-110 F. The air intake temp also read a negative #. For the last couple of months I have been getting CEL's and getting the P 1124 and such error codes. I do nothing and the CEL does not come back for weeks. Is it possible that both have intermentant failures and when they line up a CEL goes on? Thanks, Ed

wvicary Member

wvicary

Posted
Posted

The air temp sensor shouldn't be reading negitive. I believe the air temp sensor is part of the MAF sensor, check the connection on the MAF sensor to make sure it is clean and engages correctly. If the problem continues replace the MAF as they are known to fail often. It is possible for two sensor to fail at the same time though the odds are rather against it.

cvhs18472 Member

cvhs18472

Posted
  • Author
Posted
The air temp sensor shouldn't be reading negitive. I believe the air temp sensor is part of the MAF sensor, check the connection on the MAF sensor to make sure it is clean and engages correctly. If the problem continues replace the MAF as they are known to fail often. It is possible for two sensor to fail at the same time though the odds are rather against it.

I just replaced the MAF about 7Kmiles ago. Do you think thaqt it could fail that soon? Ed

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RFM Member

RFM

Posted
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The cluster and the DME use the same temp.sensor, the cluster values looks OK what means that the sensor is not the cause. Make a bridge with a single wire from the sensor to the pin on the DME and read the values again, if they are approx. the same as the cluster there most by something wrong with the wiring ( corrosion on a pin or a junction ).I'm sorry i have no electric diagram to show. Loren can help you whit that. As wvicary wrote the intake air temp. sensor is part of the MAF, you did a replacement 7K miles ago, with a new one? the same part number? Take a spare MAF and try to use a PIWIS tester to read the values again to by sure, if thy are all still negative i'm afraid you will arrive to the DME.

cvhs18472 Member

cvhs18472

Posted
  • Author
Posted
The cluster and the DME use the same temp.sensor, the cluster values looks OK what means that the sensor is not the cause. Make a bridge with a single wire from the sensor to the pin on the DME and read the values again, if they are approx. the same as the cluster there most by something wrong with the wiring ( corrosion on a pin or a junction ).I'm sorry i have no electric diagram to show. Loren can help you whit that. As wvicary wrote the intake air temp. sensor is part of the MAF, you did a replacement 7K miles ago, with a new one? the same part number? Take a spare MAF and try to use a PIWIS tester to read the values again to by sure, if thy are all still negative i'm afraid you will arrive to the DME.

I may be calling an item by the wrong name. The readings that I gave were accurate as far as the testing was concerened but awhile ago the sensor that was on the air plenium was loose and I got the P1124 and such error codes. I pushed it firmly in place and no more lights for about 1 1/2 months and 2K miles. Now this series of P codes. What is the sensor on the plenium? Sorry for the lack of knowledge, but educate me and I will know and be able to help others as you have helped me. Thanks, Ed

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RFM Member

RFM

Posted
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Posted

The engine bay environement temp. sensor is on the plenium ( to ventilate by the fan on the right side ).

Do you have a picture?

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