I keep getting codes i dont reconize. these are all generic obdII codes: P0036, P1138, and P1237. I got a new turbo control valve and the check engine light keeps coming on. I keep getting P0303 pending, 0134, 0135, and 0136. the O2 sensors are ok. I checked everyhing and they all seem ok. I'm also getting P0442 once in awhile. I'm stummped and i have to get this fixed to pass emissions. If anyone knows the equal volvo codes and can trouble shoot them with me. I'll be extremly greatful. By the way,ru car has 251,000 miles on it. she runs great but being stubborn now.

thanks a mil.

 

The rear O2 is working good? The 0036 means the heater in the sensor is bad.

Are the hoses on the turbo control valve connected properly?

The other codes are a misfire code.

P0442 is an evap system leak code. That could be alot of things as well.

 

Last week the sensor 1 was acting up. this week its sensor 2. I made sure the connections were good but i still got the code. P0442 would relate to the gas cap, rite? All the hoses going to the turbo are snug. Whats the heater circuit?

 

Yes the P0442 is the evap system and gas cap.

The heater circuit is in the sensor first thing when the car is cold the O2 sensor heats up before reading. Part of the program is for the O2 to heat up then when in closed loop it reads.

 

Any idea what P1139 is? Do you think the evap leak could cause all these codes?

 

Was it 1138 or 1139?
1139 is rear O2 sensor.

 

It's 1139. How can both O2 sensors go bad, what are the odds?

 

More common than you think. LOL

 

That sucks! O2 sensor 1 is only 2 years old!. But its only a pending code. The code hasnt matured yet. The codes are coming and going. I dont get it. Do think the Ecu is going bad?

 

Possible but I doubt it.
The only ECU's I have replaced were due to Lightning strikes.

 

Were would be the most common evap leak occur pertaining to P1237? All the turbo lines look good and snug. The turbo control sensor was just replaced. I've done a head gasket job and a number of other things on this car, but these codes are driving me crazy. Its like a snowball effect.

 

The evap system is seperate.

There is a few common things.
Bad gas cap,hose broke at the rollover valve next to the fuel filter,crack in the fuel pump assembly.

 

I'll check them out.