'98 S70 GLT Codes read, now what to do?

francisp · Post by **francisp** » 20 Jul 2014, 16:50

I had the problem codes read and I have the following:
P0133 - Oxygen sensor circuit slow response Bank 1 Sensor 2
P0440 - Evaporative Emission System
P0116 - Engine coolant temperature sensor 1 circuit
Range/Performance
I guess I'll be asking as to where to begin. Many Thanks for your thoughts and suggestions.

Post by **rspi** » 20 Jul 2014, 17:10

I guess you need to search for the solutions to those codes and decide if you will fix them yourself or have someone else fix them.

Post by **abscate** » 21 Jul 2014, 04:13

Do you have any running problems?

The evap code is probably a leaky hose or gas cap. It won't affect driveability.

The 02 sensor code is probably pointing at a tired O2 sensor. If you have over 100k on the car, it's time to replace them.

The ECT lives under the thermostat..check the wiring and plug for corrosion.the sensor does go on these cars and will give you starting and running problems too. The car needs extra fuel when cold so if the sensor or wiring sends bad info, the cars floods out with too much fuel.

francisp · Post by **francisp** » 24 Jul 2014, 15:46

Thanks abscate. I'll try those remedies. The CEL has been on for over a year since I bought it back in April '13.

RigsPGT · Post by **RigsPGT** » 24 Jul 2014, 18:04

Try resetting the codes and scan again later on. I've had the coolant sensor code once, reset it, drove the car for 3k miles and still no signs of that code returning. I also get the evap code once in a blue moon but once reset, it take a couple of thousands miles to pop up again. I'd say check the mood of the codes and their appearance and then decides but my first move would be towards a new oxygen sensor.

francisp · Post by **francisp** » 24 Jul 2014, 18:43

Thanks, I was leaning toward that. I think at 128K, it's time for a new one.

Post by **abscate** » 24 Jul 2014, 19:39

Timing belt too??

JeffHicks · Post by **JeffHicks** » 24 Jul 2014, 19:53

francisp wrote:I had the problem codes read and I have the following:
P0133 - Oxygen sensor circuit slow response Bank 1 Sensor 2
P0440 - Evaporative Emission System
P0116 - Engine coolant temperature sensor 1 circuit
Range/Performance
I guess I'll be asking as to where to begin. Many Thanks for your thoughts and suggestions.

P0133 - Replace your O2 Sensor - most likely the upstream one. I used a Denso 234-9020 for mine (rather than the Volvo OEM that was MUCH more spendy) and it has worked great.

P0440 - Check for vacuum leaks. This could actually be what is tripping the O2 Sensor code.
P0116 - Erase codes and see if it happens again. Could have been a fluke.

That's where I'd begin.

francisp · Post by **francisp** » 25 Jul 2014, 05:06

@ abscate-Timing belt was replaced at 87k and I now have 128k.

francisp · Post by **francisp** » 30 Jul 2014, 17:38

Just a quick follow up: I disconnected the battery and left it off for about 10 minutes. After reconnecting it, the CEL is obviously off. Now let me see if it comes back any time soon. If so and the P0133 and P0440 code pops up again, then I'll change the O2 Sensor. So far I'm at 200+ miles and it's running smoothly.