After running a scan with my bluedriver reader I found this error. I'm not sure what it is referring too. Any help would be appreciated.

ID: 02 03. Min: -. Val: 0x23. Max: 0x20. Lean to rich sensor threshold voltage (constant). Status: Complete and Fail.

After a cold start the vehicle smells rich, I suspect it may be an O2 sensor but could be wrong.

I also still have the cursed PO442 code. Where can I find a detailed chart which identifies all the sensors and switches under the hood?

Thanks,

Brian

 

Hello,

I am not exactly familiar with the BlueDriver, can you please post a screenshot of what you see?

Take a look at your Fuel Trims, they should be as close to zero as possible, but as long as they are below 10%, it is considered acceptable for an old vehicle. As for the A/F or O2 sensors, you can also check their readouts. To my knowledge, you should have 2 A/F sensors, and 2 O2 sensors. Here you can find more information, but in short, for the A/F sensor, you should see it stay close to, but not stuck on 3.2-ish volts. O2 sensor should output about 0.5V, and also not shift around very rapidly.

And lastly, here you can find an OEM parts catalogue that shows all the parts and their location on the car.

Hope this helps and best of luck!

 

Here is the screen shot of the BlueDriver screen. Sorry for the size

 

I may have a theory on what happened - the window you showed is a Mode $06, which basically shows the results of on-board diagnostic monitoring tests; if overly simplified, it is a step right before the Check Engine Light. It seems like Lean to Rich sensor is an O2 sensor, and its readouts are higher than the ECU would like, which may indicate either a bad O2 sensor, or an inefficient catalyst. Please refer to my previous post on how to check those.

Hope this helps and best of luck!

 

Decoding Mode 06 Data

TID (Test Identification Data) is assigned to each emission--related component.

• TLT (Test Limit Type):
• TLT is 0, the component is malfunctioning when the test value is higher than the test limit.
• TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
• CID (Component Identification Data) is assigned to each test value.
• Unit Conversion is used to calculate the test value indicated on generic OBD scan tools

TID $02: EVAP
(a) Fuel tank pressure monitor
TLT CID - Description of Test Value - Description of Test Limit
1 $03 - Test value of EVAP VSV:
- Determined by pulsation of canister pressure change generated by EVAP VSV operation - Malfunction criterion for EVAP VSV

0 $03 - Test value of 0.04 inch leak:
- Determined by fuel tank pressure change - Malfunction criterion for 0.04 inch leak

P0442
CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for canister closed valve (CCV) and VSV for pressure switching valve are
used to detect abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the
vapor pressure sensor signal.

DTC P0440 or P0442 (small leak) is recorded by the ECM when evaporative emissions leak

After cold starting and when generating certain swift pressure
value in fuel tank enabling not to hold that value (2 trip detection
logic)

Trouble Area

• Hose or tube cracked, hole, damaged or loose seal fuel tank to canister
• Fuel tank cap incorrectly installed
• Fuel tank cap cracked or damaged
• Vacuum hose cracked, holed, blocked, damaged or disconnected - VPS to fuel tank, VSV to canister
• Fuel tank cracked, holed or damaged
• Charcoal canister cracked, holed or damaged
• Open or short in vapor pressure sensor circuit
• VSV for CCV
• VSV for EVAP
• VSV for pressure switching valve
• Vapor pressure sensor
• Fuel tank over fill check valve cracked or damaged
• ECM