Repeat bad o2 sensors, oil burning, engine cuts in clutch

What about O2 sensor ? is there a code ? There are several DTC'S for O2 sensors . Did you check the oil an is it full ? The IPC illuminates the LOW ENG OIL LEVEL indicator in the message center when the powertrain control module (PCM) detects low engine oil level, and the signal circuit is high. The IPC receives a class 2 message requesting illumination from the PCM.
Is the trunk open ? if not you need to have it checked out ,could need a Rear Compartment Lid Ajar Indicator Switch Replacement .
Your best bet would be to take your vehicle to a ASE certified repair facility .
Yoy

Contamination from oil comsumtion your engine probably go thrue lots of oil

heater is part of the 02 sensor. Replace sensor

To review, the check engine light will stay on until the problem is fixed and the code or codes are erased. And if the O2 sensor is disconnected the light will stay on for sure.
Do you have the trouble codes stored in the computer ?
FYI - the cylinders should have over 100psi of compression.

I think I would have it replaced.

First, I wouldn't let that guy work on your car. P1133 is "O2 Sensor Slow Response - Sensor 1" Anybody that has been in the auto repair business for more than a week should know that Sensor 1 is ALLWAYS the FRONT sensor.

Note: O2 sensor codes do not necessarily mean that an O2 sensor needs to be replaced. Most O2 Sensor codes are caused by something other than the O2 Sensor itself. (there are several different possible O2 Sensor codes for your car. P0131, P0132, P0133, P0134, P0138, P0171, P0172, P1133, P1134)

The most likely cause of DTC (Diagnostic TroubleCode) P1133 is contamination of the O2 Sensor. Replacing a contaminated O2 Sensor without repairing the source of the contamination will only result in a repeat repair. It could be caused by bad fuel, improper use of RTV sealant, engine oil or engine coolant. I have seen this caused many times by engine oil leaks that run down the exhaust and clog the holes in the side of the sensor shield. (The sensor must "breathe" to work properly)

Then on the other hand, if your vehicle has a lot of miles on it, the sensor could be just chemically worn out. In any case, the FRONT sensor is the one that is setting the code.

po420 is catalylic converter system efficiency below threshold, which means converter is not burning or cleaning exhaust good, i ve found that 90% of the time its bad o2 sensors they give off a false reading to computer, replace the frt and rear o2 sensors and reset engine light that should take care of problem, if cat con verter happens to be no good its no loss because new o2s should be replaced with new converter, but i think o2s will solve youe problem. hope this helps.goodluck.

I've always found the following to help with emissions tests on older cars: Check & replace air cleaner if dirty (difficult to see light through it), Check spark plugs ( will also be good indicator of any bad cylinder so keep them in order of removal) - if any look/measure bad, replace the set. Check engine oil quality & replace if dirty (or you can't remember the last  time it was changed). Dirty oil = higher emissions.
Run engine on higher grade fuel for a few days and during test (better fuel = lower emissions). If o2 sensor is the problem it will set off codes.

O2 sensors indicate unburned oxygen in the exhaust sysytem. Bad O2 sensors causes fuel mixture to run rich. It causes fuel consumption and your emmissions test will not pass. Check for vacuum leaks check the manifold.check for a misfiring cylinder, a burned exhaust valve that is leaking compression. replace the O2 sensor or sensors. Some cars have 2 . One for the intake another for the out take. If it reads a code for the Map sensor along with the O2. It is better ifyou replace both sensors. But I think that the problem lies in the oxygen sensor or sensors. Pleae vote my answer if this helps.

The code says there is a problem, it does not say where in the circuit the problem is, it could be the wiring to the sensors, it could be the PCM (powertrain control module) in your case it sounds like an intake manifold vacuum leak.