Hello all, I have a 97 Civic with a 1998 Type-R motor b18c5 and i have code 91. Does anyone know how to fix it? Code 91 is "LOW FEUL PRESSURE IN TANK"
Any replies will be appreciated.
Thanks Marco
97CivicType-R

 

If you are using the stock usdm itr ecu, you will get that code because you are missing a sensor in the gas tank that the itr's have. You can either switch gas tanks, I think the ex has that sensor, or you can use a jdm itr ecu or an obd1 ecu. Those ecu's don't look for that sensor.

 

after I get my swap done i am going to look into bypassing this. That sensor gets the same power suply as TPS sensor and also shares the sensor ground for TPS; TPS reads 0-4.8v so I think that some where in this area will get rid of this problem. Hopefully it will work and the code 91 will be cracked. If any one has a helms for a car that has this sensor and could tell me what the ecm looks for from this wire ill try it on mine and see what happens. Buy the way I am using a 99 ls computer. If anyone has tried this and failed im me your experince(SP)