swap the two rear o2 sensors and see if the code changes to P0420 if it does then the sensor that was in the right which you moved to left for testing is faulty. If not a new catalytic assembly is required and there are performance one available if you like.
OR
P0430
DTC P0430 TWC System Low Efficiency Bank 2 (1 Of 2)
DTC P0430 TWC System Low Efficiency Bank 2 (2 Of 2)
TWC System
CIRCUIT DESCRIPTION
In order to control emissions of Hydrocarbons (HC), Carbon Monoxide (CO) and Oxides of Nitrogen
(NOx), a three-way catalytic converter is used. The catalyst within the converter promotes a chemical reaction which oxidizes the HC and CO present in the exhaust gas, converting them into harmless water vapor and carbon dioxide. The catalyst also reduces NOx, converting it to nitrogen. The Vehicle Control Module
(VCM) has the capability to monitor this process using HO2S 2. HO2S 2, located in the exhaust stream past the three-way catalytic converter, produces an output signal which indicates the oxygen storage capacity of the catalyst; this in turn indicates the catalysts ability to convert exhaust emissions effectively. If the catalyst is functioning correctly, the HO2S 2 signal will be far less active than that produced by HO2S 1. If a problem exists which causes the VCM to detect excessive HO2S 2 activity outside of an acceptable range for an extended period of time, the VCM will set DTC P0430, indicating that the three-way catalytic converters oxygen storage capacity is below a threshold considered acceptable. DTC P043O is a type A DTC.
CONDITIONS FOR SETTING THE DTC
- No Vehicle Speed (VS) sensor DTCs.
- No Throttle Position (TP) sensor DTCs.
- No HO2 sensor DTCs.
- No misfire DTCs.
- No Manifold Absolute Pressure (MAP) sensor DTCs.
- No fuel trim DTCs.
- No Engine Coolant Temperature (ECT) sensor DTCs.
- Engine coolant temperature is above 75°C (167°F).
- Vehicle is in Closed Loop fuel control.
- Above conditions met for a period of time to ensure a warm catalyst (at least 2 consecutive minutes).
- Calc. eng. load is steady.
- Vehicle speed is steady between 20 mph and 70 mph.
- HO2S 2 activity has been determined to be excessive by the VCM.
- All above conditions for up to 2 additional minutes after catalyst warm-up criteria has been met.
ACTION TAKEN WHEN THE DTC SETS
The
VCM will turn ON the
Malfunction Indicator Lamp (MIL).
CONDITIONS FOR CLEARING THE MIL/DTC
The
VCM turns the MIL off after 3 consecutive driving trips without a fault condition present. A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 40°F from the start-up coolant temperature and the engine coolant temperature exceeds 160°F during that same ignition cycle) or the scan tool clearing feature has been used.
DIAGNOSTIC AIDS
Difficulty running the OBD II status DTC P0430 test may be encountered in areas where test conditions cannot be maintained easily, especially in urban areas. To minimize the amount of driving required to complete the test, use the following procedure
- Catalyst can be warmed up in service bay previous to drive cycle.
- Engine also can be warmed up in bay also. HO2S 2 activity test: Using a scan tool, monitor MAP, HO2S 1, and HO2S 2 displays in Park or Neutral above idle. Compare HO2S 1 and HO2S 2 activity (amplitude and frequency) to each other during a 30 second period. If HO2S 2 activity is nearly as great as HO2S 1 activity, a problem exists; use diagnostic table on facing page. If much less activity is noted, system is functioning properly.
TEST DESCRIPTION
Number(s) below refer to the step number(s) on the Diagnostic Table.
