Po503
Po503 Car does not idle very good. Autozone scanned it and PO503 came up as well as PO153. I'm guessing I need a couple new O2 sensors but I'm not sure what the PO503 is all about. Sorry but search still doesn't work. Thanks for any help.
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent
P0153 -- slow response bank 2 sensor 1
Most likely a lazy O2 sensor... if you still have your rear post cat O2 sensors you can try those... they're the same as fronts on F-Bodies
the 503 I'm not sure on... when did the SES start? after any mods ? (especially around the tailshaft of the transmission?)
P0153 -- slow response bank 2 sensor 1
Most likely a lazy O2 sensor... if you still have your rear post cat O2 sensors you can try those... they're the same as fronts on F-Bodies
the 503 I'm not sure on... when did the SES start? after any mods ? (especially around the tailshaft of the transmission?)
The SES came on after mods. I did the H/C swap and the SES light came on with several codes. I then had the car dynotuned and had the downstream O2 codes deleted since I'm running ORY. I also had the EGR deleted. Shortly after having the car dynotuned the SES light came on and PO503 and PO153 is what came up on the scanner. Is bank 2 sensor 1 on the driver side or passenger side? When I had the PCM scanned at autozone the scanner said something about idle for PO503. The car does not idle very good. I usually have to put my foot on the pedal a little to keep it running. I don't think the idle problem is related to the cam.
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
the P0153 code will put you into open loop operation which can explain the poor idle
P0503 i got off http://www.obdii.com/codes.asp (sticky on top)
503 is the VSS which I believe is at the tailshaft of the trans
Bank 1 = Driver Side
Bank 2 = Passengar Side
Sensor 1 = pre cat
Sensor 2 = post cat
P0503 i got off http://www.obdii.com/codes.asp (sticky on top)
503 is the VSS which I believe is at the tailshaft of the trans
Bank 1 = Driver Side
Bank 2 = Passengar Side
Sensor 1 = pre cat
Sensor 2 = post cat
